[Bug 1550779] [NEW] [i915]] *ERROR* CPU pipe A FIFO underrunXorg glitches

[Hubert Hesse]

Public bug reported:

Upgraded linux-image-extra-4.2.0-30-generic I see graphic glitches,
looks like the graphic buffer gets screwed up

- funny repetition's patterns (back in time glitches)
- black screen (<1sec)
- graphic errors

I can influence the severity of the issue with switching windows and
using certain programs, e.g. Google Maps in chrome causes this issue
reproducibly

dmesg | grep i915
[ 2.726864] [drm] Initialized i915 1.6.0 20150522 for 0000:00:02.0 on minor 0
[ 2.792005] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[ 3.471092] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 3.471093] i915 0000:00:02.0: registered panic notifier
[ 9.573129] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[ 9.574847] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[ 9.574895] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

linux-image-extra-4.2.0-27-generic works find

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 4.2.0-30.36-generic 4.2.8-ckt3
Uname: Linux 4.2.0-30-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
BootLog:

CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Sat Feb 27 20:26:07 2016
DistUpgraded: Fresh install
DistroCodename: wily
DistroVariant: ubuntu
DkmsStatus:
virtualbox, 5.0.14, 4.2.0-27-generic, x86_64: installed
virtualbox, 5.0.14, 4.2.0-30-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device [17aa:21da]
InstallationDate: Installed on 2016-02-11 (15 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: LENOVO 42912XG
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.2.0-30-generic root=UUID=cb34d7bb-9316-49b3-aa94-4e2a3512168f ro rootflags=subvol=@ noprompt quiet
SourcePackage: xorg
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/18/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET69WW (1.39 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42912XG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8DET69WW(1.39):bd07/18/2013:svnLENOVO:pn42912XG:pvrThinkPadX220:rvnLENOVO:rn42912XG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 42912XG
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+15.10.20151202-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Sat Feb 27 20:25:23 2016
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
product id 12359
vendor SEC
xserver.version: 2:1.17.2-1ubuntu9.1

** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New


** Tags: amd64 apport-bug ubuntu wily
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[i915]] *ERROR* CPU pipe A FIFO underrunXorg glitches

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[Hubert Hesse]

Maybe related to https://bugs.launchpad.net/bugs/1451632
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[i915]] *ERROR* CPU pipe A FIFO underrunXorg glitches

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[Hubert Hesse]

See recording on http://tinypic.com/r/2wpt74m/9 (glitches where not
visible on a direct screen grab)
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[Hubert Hesse]

With the previous kernel I don't see the glitches nor the i915 underruns
$ uname -a
Linux river 4.2.0-27-generic #32-Ubuntu SMP Fri Jan 22 04:49:08 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
$ dmesg | grep i915
[ 2.698444] [drm] Initialized i915 1.6.0 20150522 for 0000:00:02.0 on minor 0
[ 2.763865] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[ 3.498858] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 3.498859] i915 0000:00:02.0: registered panic notifier

** Summary changed:

- [i915]] *ERROR* CPU pipe A FIFO underrunXorg glitches
+ [i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
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[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Hubert Hesse]

Maybe a duplicate of https://bugs.launchpad.net/ubuntu/+source/xserver-
xorg-video-intel/+bug/1522922 ... weird that it only occurs in the
latest kernel package
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[Christopher M. Penalver]

Hubert Hesse, thank you for reporting this and helping make Ubuntu
better.

As per http://support.lenovo.com/us/en/products/Laptops-and-
netbooks/ThinkPad-X-Series-
laptops/ThinkPad-X220?linkTrack=GPS:Body_Search%20Products&beta=false an
update to your computer's buggy and outdated BIOS is available (1.40).
If you update to this following
https://help.ubuntu.com/community/BIOSUpdate does it change anything?

For more on BIOS updates and linux, please see
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
.

Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful. As well, you don't
have to create a new bug report.

Once the BIOS is updated, if the problem is still reproducible:
1) Please provide the output of the following terminal command (not perform an apport-collect):
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
2) Please make a comment specifically advising on if there was an improvement or not.
3) Please mark this report Status New. If it's not reproducible, please mark this as Invalid.

Thank you for your understanding.

** Tags added: bios-outdated-1.40

** Changed in: xorg (Ubuntu)
Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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[Hubert Hesse]

Ah, thanks for pointing out the BIOS update. However it didn't change
anything related to the issue.

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
8DET70WW (1.40 )
05/14/2015

The flickering is also present for me in the latest mainline
$uname -a
Linux river 4.4.3-040403-generic #201602251634 SMP Thu Feb 25 21:36:25 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
$ dmesg | grep i915
[ 2.538980] i915: unknown parameter 'lvds_downclock' ignored
[ 2.778824] [drm] Initialized i915 1.6.0 20151010 for 0000:00:02.0 on minor 0
[ 4.319937] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 69.185831] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[ 69.186167] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[ 69.186184] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

since lvds_downclock is mentioned I wanted to point out my power saving options:
$ cat /etc/modprobe.d/i915.conf
options i915 enable_rc6=1 enable_fbc=1 lvds_downclock=1 semaphores=1

However removing them doesn't change anything


** Changed in: xorg (Ubuntu)
Status: Incomplete => New
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[Christopher M. Penalver]

Hubert Hesse, in order to allow additional upstream developers to examine the issue, at your earliest convenience, could you please test the latest upstream kernel available from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D ? Please keep in mind the following:
1) The one to test is at the very top line at the top of the page (not the daily folder).
2) The release names are irrelevant.
3) The folder time stamps aren't indicative of when the kernel actually was released upstream.
4) Install instructions are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds .

If testing on your main install would be inconvenient, one may:
1) Install Ubuntu to a different partition and then test this there.
2) Backup, or clone the primary install.

If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:
kernel-fixed-upstream
kernel-fixed-upstream-X.Y-rcZ

Where X, and Y are the first two numbers of the kernel version, and Z is
the release candidate number if it exists.

If the mainline kernel does not fix the issue, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-X.Y-rcZ

Please note, an error to install the kernel does not fit the criteria of
kernel-bug-exists-upstream.

Once testing of the latest upstream kernel is complete, please mark this
report's Status as Confirmed. Please let us know your results.

Thank you for your understanding.

** Tags removed: bios-outdated-1.40
** Tags added: latest-bios-1.40

** Tags added: regression-update

** Package changed: xorg (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
Importance: Low => Medium

** Changed in: linux (Ubuntu)
Status: New => Incomplete
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[Hubert Hesse]

Hi Christopher,

4.5 rc5 has indeed fixed the issue for me. Thanks a lot :)

$ uname -a
Linux river 4.5.0-040500rc5-generic #201602201730 SMP Sat Feb 20 22:32:16 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ dmesg | grep i915
[ 2.513449] i915: unknown parameter 'lvds_downclock' ignored
[ 2.743658] [drm] Initialized i915 1.6.0 20151218 for 0000:00:02.0 on minor 0
[ 4.275935] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 5.396543] snd_hda_intel 0000:00:1b.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])


** Tags added: kernel-fixed-upstream kernel-fixed-upstream-4.5-rc5

** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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[Hubert Hesse]

Ah no, I was to quick to judge. Now the error occurred with 4.5rc5, but it is less frequent. And the quality of the glitches change.
No more repetition errors, just "regular" graphic errors.

$ dmesg | grep i915
[ 2.513449] i915: unknown parameter 'lvds_downclock' ignored
[ 2.743658] [drm] Initialized i915 1.6.0 20151218 for 0000:00:02.0 on minor 0
[ 4.275935] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 5.396543] snd_hda_intel 0000:00:1b.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[ 1027.095396] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[ 1027.095477] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[ 1027.095530] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun


** Tags removed: kernel-fixed-upstream kernel-fixed-upstream-4.5-rc5
** Tags added: kernel-bug-exists-upstream kernel-bug-exists-upstream-4.5-rc5
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[Christopher M. Penalver]

Hubert Hesse, the next step is to fully commit bisect from kernel
4.2.0-27 to 4.2.0-30 in order to identify the last good kernel commit,
followed immediately by the first bad one. This will allow for a more
expedited analysis of the root cause of your issue. Could you please do
this following https://wiki.ubuntu.com/Kernel/KernelBisection ?

Please note, finding adjacent kernel versions is not fully commit
bisecting.

After the offending commit (not kernel version) has been identified,
then please mark this report Status Confirmed.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

** Tags added: needs-bisect

** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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[Hubert Hesse]

So it turn out when I rebuild the package for 4.2.0-27 I already see
that glitches occurring in that specific kernel version. So it look like
there is difference between the package I built and the official package
or I screwed up the build process?

Here is what I did, I have to say the wik page you linked was very
verbose. I know what git bisect works, however I don't how to build a
Ubuntu kernel package (kteam-tools produced some errors for me)

I took the steps from https://wiki.ubuntu.com/KernelTeam/GitKernelBuild#Using_Ubuntu_Kernel_Configuration
Can you check if those steps should produce a correct package?

sudo apt-get install git build-essential kernel-package fakeroot
libncurses5-dev libssl-dev ccache --no-install-recommends # because of
texlive

git clone git://kernel.ubuntu.com/ubuntu/ubuntu-wily.git
cd ubuntu-wily/
cp -a /usr/share/kernel-package ubuntu-package

cp debian/control-scripts/{postinst,postrm,preinst,prerm} ubuntu-package/pkg/image/
cp debian/control-scripts/headers-postinst ubuntu-package/pkg/headers/

# set up ccache because I thought this will save time while bisecting -- however mostly cache misses
vim ~/.bashrc
if [ -d /usr/lib/ccache ]; then
export PATH=/usr/lib/ccache:"${PATH}"
export CCACHE_NLEVELS=5
fi
ccache -M 10G

cp /boot/config-4.2.0-27-generic .config
make localmodconfig # because building all modules takes forever
make oldconfig

CONCURRENCY_LEVEL=`getconf _NPROCESSORS_ONLN` fakeroot make-kpkg
--initrd --append-to-version=-custom --overlay-dir=$(pwd)/ubuntu-package
kernel_image kernel_headers

cd ..
dpkg -i *.deb

#git tag --list
#git bisect start
#git bisect good Ubuntu-4.2.0-27.32
#git bisect bad Ubuntu-4.2.0-30.36
# Here I did noticed that after the 6 commits all commits where bad. Then I checked the assumption that "Ubuntu-4.2.0-27.32" was good, it was not
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[Hubert Hesse]

any news on this?

** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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[Christopher M. Penalver]

** Tags removed: latest-bios-1.40
** Tags added: bios-outdated-1.42
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[Hubert Hesse]

Can anyone confirm the steps I took where all right?
What's the difference between the kernel I compiled and the officially distributed one (4.2.0-27)? Any patches to reproduce the official binary?
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[Hubert Hesse]

** Tags removed: needs-bisect
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[PocketSam]

Same problem for me. I can easily reproduce a problem my moving mouse
over youtube video borders. If it's needed I can record a video. Should
I do that?
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[Christopher M. Penalver]

** Tags added: needs-bisect
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[Alexander List]

Still happening on Xenial with latest distro kernel:

[ 12.777803] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[ 12.777826] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

Linux hkgofdt02 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC
2016 x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04 LTS
Release: 16.04
Codename: xenial
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[PocketSam]

What can I do to help determine the cause of a problem or fix it?
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[Hubert Hesse]

See https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1522922 Nothing really, except to stick with 4.1.21
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[PocketSam]

Also a funny glitches happen with Google Documents very often.

** Attachment added: "Снимок экрана от 2016-04-28 08-21-35.png"
Loading Image...
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[Christopher M. Penalver]

PocketSam, it will help immensely if you filed a new report with the Ubuntu repository kernel (not mainline/upstream) via a terminal:
ubuntu-bug linux

Please feel free to subscribe me to it.

For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.
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[PocketSam]

Christopher, I hope I did everything right.
Here is my new bug report:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1577099
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[Christopher M. Penalver]

** Attachment removed: "Снимок экрана от 2016-04-28 08-21-35.png"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1550779/+attachment/4649672/+files/%D0%A1%D0%BD%D0%B8%D0%BC%D0%BE%D0%BA%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0%20%D0%BE%D1%82%202016-04-28%2008-21-35.png
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[Hubert Hesse]

I'm still seeing the issue with latest:
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/current/
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.10-xenial/
Where other people report the issues are fixed for them

However not as severe as with 4.2.0-30.36

Can someone please advise what to do? My questions from #14 are still unaddressed:
Can anyone confirm the steps I took where all right?
What's the difference between the kernel I compiled and the officially distributed one (4.2.0-27)? Any patches to reproduce the official binary?
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[Dirk Heumann]

Hi all, I was bugged by this both in Ubuntu 16.04 (any 4.4 kernel after release) and in ArchLinUX with all actual 4.5 kernels.
My solution was to take the 4.6 kernel on ArchLinUX (testing repository), after which I was cured from all difficulties. If you use VirtualBox with a new 4.4/4.5 kernel in your client, you get very often bugged by this failure.
--> If you can, use LinUX kernel 4.6.
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[Hubert Hesse]

I can also confirm that upgrading to 16.04 and using a 4.6 kernel
(http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-yakkety/) solves the
issue for me.
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[Christopher M. Penalver]

** Tags removed: needs-bisect
** Tags added: kernel-fixed-upstream-4.6 needs-reverse-bisect
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[Christopher M. Penalver]

Hubert Hesse, the next step is to fully reverse commit bisect from
kernel 4.5-rc5 to 4.6 in order to identify the last bad commit, followed
immediately by the first good one. Once this good commit has been
identified, it may be reviewed for backporting. Could you please do this
following
https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F
?

Please note, finding adjacent kernel versions is not fully commit
bisecting.

After the fix commit (not kernel version) has been identified, then
please mark this report Status Confirmed.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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[PocketSam]

If I understand correctly we should install different linux kernel versions untill we find a kernel, that fixes bug?
I'm a bit confused what link I should use to sort out kernels. Can you suggest, please?
Try kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline/ from v 4.4 to 4.6. ?
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[bhat3]

@Christopher To demand a full bisect for the status "confirmed" is IMHO
much over the edge, especially as it takes some time to trigger the bug.

@PocketSam Although Chrisopher's advice is right to follow, if you
gather the information with which mainline kernel the bug disapers it
would still be good. And you don't need so much technical background or
time in my case ;)
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[pavel bursa]

Linux xenie 4.4.0-24-generic #43-Ubuntu SMP
Intel® Core™ i3-4160 CPU @ 3.60GHz × 4
Ubuntu 16.04 LTS 64 bit


[Út čen 14 00:11:03 2016] vboxpci: IOMMU not found (not registered)
[Út čen 14 00:11:03 2016] nf_conntrack: automatic helper assignment is deprecated and it will be removed soon. Use the iptables CT target to attach helpers instead.
[St čen 15 00:18:28 2016] perf interrupt took too long (2512 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[St čen 15 01:37:31 2016] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A
[St čen 15 01:37:31 2016] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[St čen 15 01:40:53 2016] snd_hda_codec_hdmi hdaudioC0D0: HDMI: ELD buf size is 0, force 128
[St čen 15 01:40:53 2016] snd_hda_codec_hdmi hdaudioC0D0: HDMI: invalid ELD data byte 0
[St čen 15 02:08:53 2016] snd_hda_codec_hdmi hdaudioC0D0: HDMI: ELD buf size is 0, force 128
[St čen 15 02:08:53 2016] snd_hda_codec_hdmi hdaudioC0D0: HDMI: invalid ELD data byte 0
[St čen 15 02:08:55 2016] snd_hda_codec_hdmi hdaudioC0D0: HDMI: ELD buf size is 0, force 128
[St čen 15 02:08:55 2016] snd_hda_codec_hdmi hdaudioC0D0: HDMI: invalid ELD data byte 0
[St čen 15 19:56:52 2016] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A
[St čen 15 19:56:52 2016] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[St čen 15 20:28:09 2016] usb 3-9.1: USB disconnect, device number 3
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[bhat3]

@pavel See https://wiki.ubuntu.com/Kernel/MainlineBuilds and try which
newer kernel solves the issue.
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[elleP]

While much less frequent than when using a 4.4 kernel, the problem still
occurs for me when using a 4.6 kernel:

uname -a
4.6.0-040600-generic #201606030904 SMP Fri Jun 3 13:06:01 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

dmesg
[31606.245708] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[31606.245846] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
[40612.123848] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[40612.123987] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

Ubuntu 16.04 LTS
Intel(R) Core(TM) i5 CPU M 520
Thinkpad T410
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[alphac]

Happens the same with 4.4.0-24-generic
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[Anthony Roach]

I was having this same problem running kernel 4.4.0-28-generic in 16.04.
Upgrading to kernel 4.6.3-040603-generic seems to have resolved the
problems (or at least made it rare enough that I don't notice it
anymore). On 4.4 the graphic errors were particular common (every few
seconds) when using gotomeeting or other video chat web sites that use
WebRTC via Google Chrome (with Chrome video acceleration turned off).
The screen going blank for 1 second problem seemed particularly common
when alt-tabbing between Gnome Terminal instances. The "*ERROR* CPU pipe
A FIFO underrun" in dmesg has also stopped.
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[Anthony Roach]

Correct to my previous comment. After running on kernel
4.6.3-040603-generic I do still see the "funny repetition patterns (back
in time glitches)", but it seems less frequent. The other problems
(black screen and buffer underrun in dmesg) have not recurred.
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[bhat3]

I actually switch back to my x230 and don't have the hardware for
testing, but we should really bisect this issue so the current xenial
kernel can be fixed.

Anyone who wants to help can test those kernels
https://wiki.ubuntu.com/Kernel/MainlineBuilds especially the late 4.4
and the early 4.5 i guess the fix came in between. Just install and
reboot :)
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[Hubert Hesse]

I don't see the need for a bisect. To quote https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1522922/comments/125
"There's one thing I still don't understand... the root of the problem was identified in https://bugs.freedesktop.org/show_bug.cgi?id=91393#c25"

The associated patch http://patchwork.freedesktop.org/patch/msgid/1466162081-12042-1-git-send-email-***@intel.com revert two commits identified there.
These have to backported to archive the same experience as on the latest 4.6

My original question from #14 remains
Can anyone confirm the steps I took where all right?
What's the difference between the kernel I compiled and the officially distributed one (4.2.0-27)? Any patches to reproduce the official binary?

** Bug watch added: freedesktop.org Bugzilla #91393
https://bugs.freedesktop.org/show_bug.cgi?id=91393
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[bhat3]

@Hubert Of course it doesn't need a bisect when you already know the
commit the fixes it :) But i would sugest that we try to get it fixed in
xenial's kernel first. Unfortunately i can't assign the kernel team, can
you help out here?

** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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[Christopher M. Penalver]

bhat3, unfortunately, we don't know if the commit fixes it, as it hasn't
been tested on the original reporter's (Hubert Hesse) hardware.

** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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[Christopher M. Penalver]

Hubert Hesse, regarding your question, bisecting the Ubuntu kernel can
be tricky, hence you are better off refocusing onto the reverse bisect
of the mainline kernel to confirm the fix commit, and reverting it
causes the issue again.
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[bhat3]

@penalvch Thanks for the info, but can you assist us on how to test and
get a fix in xenial's kernel. I am out of kernel packaging since 2.6.33
and want to help to make xenial working on Thinkpads with docking
stations.
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[Christopher M. Penalver]

bhat3, if one thinks they have identified a fix commit, they may test it
via
https://wiki.ubuntu.com/Kernel/KernelBisection#Testing_a_newly_released_patch_from_upstream
.
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[bhat3]

@penalvch I understand and would like to identify it, but unfortunately
i can't trigger that bug on neither my x220 nor my x230 while all T450s
should have problems with external display and docking stations. With
linux-*-lts-* packages it will at least be resolved at least in autum :)
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[Søren Holm]

bhat3 - I'm seeing the problem after upgrading to current 16.10. What do
you wan't me to try out on my system to track down the bug?
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[gdi2k]

Since upgrading to 16.04 on an X250 and T450s, I have had screen
blanking issues with external displays on both machines. When the screen
is more "active", such as when watching YouTube, the screen would go
blank for 2 - 3 secs, then come to life again. The more "active" screen
is the one that would blank.

I would see related kernel messages (IFO underrun) sometimes, but not
always.

I've just spent some time testing various kernels and can report that
4.6.7 (wily) is working well for me and the screen blanking issue is
finally gone! Bliss.

Happy to do more testing if it helps anyone.
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[PocketSam]

gdi2k, can you provide what kernel version did you test before 4.6.7
that had this bug?
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[Christopher M. Penalver]

gdi2k, it will help immensely if you filed a new report with the Ubuntu repository kernel (not mainline/upstream) via a terminal:
ubuntu-bug linux

Please feel free to subscribe me to it.

For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.
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[Christopher M. Penalver]

123vier (flowrist), it will help immensely if you filed a new report with the Ubuntu repository kernel (not mainline/upstream) via a terminal:
ubuntu-bug linux

Please feel free to subscribe me to it.

For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.
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[123vier]

I'm experiencing the exact same issues, especially those of
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1550779/comments/43.

Upgraded from 15.10 to 16.04 (Linux 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
)

This makes my machine unusable and I'll have to revert to 15.10.

Machine is a Dell Latitude e6410 Laptop.
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[Alan Robertson]

I just took some updates to a number of graphic libraries on 16.04, and
now I can't login to kubuntu. The symptom is that it takes my password
on the greeter screen, but never updates the screen after that.

The messages include these apparently related kernel messages:
kernel: [ 701.564034] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B
kernel: [ 701.564054] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

It is, of course, unclear whether these libraries triggered the kernel
bug or if this is unrelated to the kernel bug. I attached it here
because this is what I noticed first.

I'm currently running kernel 4.4.0-36.

Here are my most recent updates. The problem started after I rebooted.
Of course that was the next time I logged in too...

Start-Date: 2016-09-07 08:46:04
Commandline: /usr/bin/unattended-upgrade
Remove: libcdaudio1:amd64 (0.99.12p2-14), linux-image-extra-4.2.0-36-generic:amd64 (4.2.0-36.42), linux-image-extra-4.4.0-22-generic:amd64 (4.4.0-22.40), gtk2-engines-murrine:amd64 (0.98.2-0ubuntu2.1), linux-image-extra-4.4.0-24-generic:amd64 (4.4.0-24.43), libslv2-9:amd64 (0.6.6+dfsg1-3build1), linux-image-extra-4.4.0-28-generic:amd64 (4.4.0-28.47), linux-image-extra-4.4.0-31-generic:amd64 (4.4.0-31.50), libfaac0:amd64 (1.28+cvs20151130-1)
End-Date: 2016-09-07 08:48:13

Start-Date: 2016-09-07 16:42:27
Install: libgnome-keyring-common:amd64 (3.12.0-1build1, automatic), libgnome-keyring0:amd64 (3.12.0-1build1, automatic)
Upgrade: libgles2-mesa:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libgles1-mesa:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libglapi-mesa:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libglapi-mesa:i386 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), p11-kit:amd64 (0.23.2-3, 0.23.2-5~ubuntu16.04.1), libxatracker2:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libegl1-mesa-drivers:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libegl1-mesa:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libegl1-mesa:i386 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), p11-kit-modules:amd64 (0.23.2-3, 0.23.2-5~ubuntu16.04.1), libgbm1:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libgbm1:i386 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), cups-filters:amd64 (1.8.3-2ubuntu3, 1.8.3-2ubuntu3.1), chromium-browser:amd64 (51.0.2704.79-0ubuntu0.16.04.1.1242, 52.0.2743.116-0ubuntu0.16.04.1.1250), libcupsfilters1:amd64 (1.8.3-2ubuntu3, 1.8.3-2ubuntu3.1), chromium-codecs-ffmpeg-extra:amd64 (51.0.2704.79-0ubuntu0.16.04.1.1242, 52.0.2743.116-0ubuntu0.16.04.1.1250), libwayland-egl1-mesa:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libfontembed1:amd64 (1.8.3-2ubuntu3, 1.8.3-2ubuntu3.1), libgl1-mesa-dri:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libgl1-mesa-dri:i386 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), cups-filters-core-drivers:amd64 (1.8.3-2ubuntu3, 1.8.3-2ubuntu3.1), libgl1-mesa-glx:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libgl1-mesa-glx:i386 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), libp11-kit0:amd64 (0.23.2-3, 0.23.2-5~ubuntu16.04.1), libp11-kit0:i386 (0.23.2-3, 0.23.2-5~ubuntu16.04.1), mesa-vdpau-drivers:amd64 (11.2.0-1ubuntu2.1, 11.2.0-1ubuntu2.2), chromium-browser-l10n:amd64 (51.0.2704.79-0ubuntu0.16.04.1.1242, 52.0.2743.116-0ubuntu0.16.04.1.1250), ubuntu-mono:amd64 (14.04+16.04.20160621-0ubuntu1, 14.04+16.04.20160804-0ubuntu1), cups-browsed:amd64 (1.8.3-2ubuntu3, 1.8.3-2ubuntu3.1)
End-Date: 2016-09-07 16:44:34

Start-Date: 2016-09-12 14:31:39
Commandline: /usr/sbin/synaptic
Requested-By: alanr (1000)
Upgrade: snapd:amd64 (2.13, 2.14.2~16.04), libappstream-glib8:amd64 (0.5.13-1ubuntu2, 0.5.13-1ubuntu3), neo4j:amd64 (3.0.4, 3.0.5), accountsservice:amd64 (0.6.40-2ubuntu11.1, 0.6.40-2ubuntu11.2), libaccountsservice0:amd64 (0.6.40-2ubuntu11.1, 0.6.40-2ubuntu11.2)
End-Date: 2016-09-12 14:32:17


** Attachment added: "Syslog from my failed attempt to log in."
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1550779/+attachment/4740111/+files/syslog.error
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[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Christopher M. Penalver]

Alan Robertson, it will help immensely if you filed a new report with Ubuntu by ensuring you have the package xdiagnose installed, and that you click the Yes button for attaching additional debugging information running the following from a terminal:
ubuntu-bug xorg

Also, please feel free to subscribe me to it.

For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.
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[Alan Robertson]

Christopher M Penalver: There is an AskUbuntu issue for my particular
problem - something a lot like it - you can find it here:
http://askubuntu.com/questions/765364/kubuntu-16-04-sddm-login-screen-
hangs I've asked if they also saw the CPU underrun - no answer yet.

FWIW, I just installed xdiagnose and enabled all 3 debug check boxes,
and it doesn't show any errors at the moment. I've worked around the
"can't login" problem at the moment, and xdiagnose doesn't show any
errors.

Of course, if I hadn't worked around the "can't login" part, then I
wouldn't have been able to launch xdiagnose to diagnose the X windows
problem ;-).

I will do as you suggested and create the additional bug report - and
will link to it here and add you to the bug report.
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[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Søren Holm]

After a couple of days with linxu 4.8.0 the problems are seems to be
gone. I just hope that it is an effect of a real change and not a timing
issue.
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[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Jimmy Merrild Krag]

4.4.0-38 seems to have done most of it for me. Could it have been resolved in another package?
I only have FIFO underrun on pipe B when I check my dmesg (running for 4 days). However, my computer is a macbook pro that needs to go around Apple soon for other hardware issues, so i'm not sure to trust it.
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[123vier]

Issue is also gone for me since the latest kernel update to 4.4.0-38,
thanks to everyone involved!
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[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Caige Nichols]

I'm seeing this behavior on my Thinkpad x260:

[123678.466040] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[123742.876516] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A (start=214815 end=214816) time 150 us, min 1073, max 1079, scanline start 1070, end 1080

$ uname -a
Linux flartchops 4.8.0-26-generic #28-Ubuntu SMP Tue Oct 18 14:39:52 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
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[Christopher M. Penalver]

Caige Nichols (caiges), it will help immensely if you filed a new report with the Ubuntu repository kernel (not mainline/upstream) via a terminal:
ubuntu-bug linux

Please feel free to subscribe me to it.

For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.
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[Rob Moore]

@penalvch: I believe I'm experiencing the same issue. I've filed a
report where I've posted the results of ubuntu-bug linux.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1645876

I'll subscribe you to it if you aren't already on it.
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[Chris]

I see the same issue on 17.04 running kernel 4.10.0-21

Firefox seems perfectly stable, but running other apps like Gnome-
Terminal, VLC and others I see black boxes, flashes and bars across the
screen. Often they come and go in a flash, but sometimes the whole
screen goes and the laptop shuts down (not gracefully - nothing in the
logs, seems like a sudden power cut).

dmesg shows a message about under run each time the graphical glitches
are seen:

"[10126.284724] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[28144.138412] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[55259.892080] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[68189.763709] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[68998.747340] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
"

I am happy to troubleshoot this, please someone make suggestions!!
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[Christopher M. Penalver]

Chris (chrisonbuntu), it will help immensely if you use the computer the problem is reproducible with, and file a new report with Ubuntu by using the default repository kernel (not mainline/upstream/3rd party) via a terminal:
ubuntu-bug linux

Please feel free to subscribe me to it.
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[Chris]

Hi Chris (penalvch) - i have done as you asked.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695989
you should be subscribed to it.
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[Chris]

Hello all, (I wrote this on my bug report - here too so people see it!!)

OK. Good news - 4.12-0rc4 seems very stable (visually at least)

I have opened 3 terminal windows, have them running 'top' and other
commands so the window contents get updated, dragged them so they hang
half off the bottom of the screen... 30 mins so far and no crashes, no
black glitches.

dmesg is free of FIFO buffer underrun messages too.

I will leave the laptop running 4.12 kernel for a couple of days to see
if there are any other issues. Let me know if you want me to share any
logs etc with you.
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[Jochen Korb]

Tested it yesterday.
Had this bug with kubuntu 16.04.2 after kernel update and later on with an update to kubuntu 17.04.

With 4.12.0-041200rc4-generic #201706042031 graphics/KDE works fine,

Installed the "all" headers and the kernel deb.

but this specific error is still listed in dmesg:
[ 3.872945] Console: switching to colour frame buffer device 160x50
[ 3.892060] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 5.137529] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
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[Chris]

Update for those not following my other bug report
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695989)

I found the bug in all the 4.11 and 4.10, but not 4.12rc1 or 4.12rc4.

NOTE - @Jochen - I dont see the FIFO underrun error while running the
4.12 kernel.
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[Jochen Korb]

@Chris; by starting my Dell Latitude 6410 this morning I see this FIFO
underrun error again booting into emergency mode.

Using 4.12rc4.

This is strange, because last Friday and Saturday I did not have any
problems.
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[Jochen Korb]

Tried other distros and Kernel versions.
I can only boot to emergency mode.

Hardware problem...seems to me.
Memtest + HDD test etc marks no errors or failures


The system is only stable in graphics mode right after installation.
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[Konrad Beckmann]

Still seeing the error message on the following setup:

- Kernel: 4.12.0-041200-generic (downloaded from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.12/)
- Ubuntu 17.04
- ThinkStation P310

[ 1130.350050] drm: not enough stolen space for compressed buffer (need 29491200 more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.
[ 1130.433925] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[ 1130.434005] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
[ 1146.868877] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.

If I get the problem again, are any specific log files of interest?
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[Tomasz Przybysz]

I'm on kernel 4.13 and got this error message as well.
The external monitor connected to laptop (Razer Blade Stealth) flickers a lot.
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[Tomasz Przybysz]

Just an update, setting a `i915.enable_rc6=0` kernel parameter helps and
the issue is gone but, as this switches of CPU and GPU energy saving,
it's rather a temporary workaround not a final solution.
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[Chris]

Kernel 4.13.2 working ok for me, run for an hour without issue so far.
Will report back after more testing.

I hope 4.13 kernels will work well, they will be in the Ubuntu 17.10
series and it would be nice to get back off the mainline kernels!
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[Chris]

Kernel 4.13.2 working fine for 2 days...
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[Tomasz Przybysz]

I've just tried 4.13.2, screen is still blinking while on with the
default i915.enable_rc6=1.

There is an improvement though. On the kernel version 4.13 my laptop was
totally crashing after hitting caps-lock twice. Now this ridiculous one
is at least gone.

Although I still need to keep the rc6=0 flag at kernel boot params to
prevent screen flickering (an external one, connected via HDMI).
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[Anton Rostotskyi]

I see graphic errors on external monitors and following messages in logs
with 4.13.0 kernel. Errors appear after laptop works for 3-4 days
without reboot.

kernel: [173125.746076] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A
kernel: [173125.746104] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
kernel: [173125.795556] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B

Ubuntu 17.10, hardware is Dell Latitude E5540
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[Urmet Jänes]

I started seeing computer lockups with kernel 4.13.0 reporting a "fifo
underrun on pipe B" when a multiple monitor setup enters power save
state. It's nearly 100% reproducible. No issues with just the laptop
screen, without an external monitor.

I've just upgraded to 17.10. As 4.13.2 is reported to resolve some
issues above, is is on the way to the distros?
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[AndrewJessop]

I have the same problem.

XUbuntu 17.04 with kernel 4.13.0-17-generic #20-Ubuntu SMP Mon Nov 6
10:04:08 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Dec 6 18:06:47 HOSTNAME kernel: [205433.429560]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe C FIFO
underrun
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[Ruben]

I have the same or a similar problem on kernel version 4.13.4, Ubuntu
17.10.

Not sure whether it is exactly the same though. In syslog I see the FIFO
underrun message is preceded by a lot of other ERROR messages:

Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.055663] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.055726] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.072359] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.072425] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.089055] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.089122] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.105722] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.105788] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.112465] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.139057] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080
Dec 26 14:33:59 ruben-Precision-5520 kernel: [ 4152.139116] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A: 0x00000080
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[hamid]

Same issue here, DELL XPS 15 9560, I noticed the error because my Gnome
Lock screen clock "stops" at the point when I locked my screen.

Ubuntu 16.04, 4.13.0-26-generic

Looking at journalctl, the last message before the clock stopped is "Jan
15 10:21:05 hamide-XPS kernel: [drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR* CPU pipe C FIFO underrun"
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[Yury Shefer]

I see the problem on my Thinkpad T450 when I connect external display on
16.04 LTS with Linux kernel 4.13.0-26-generic:

dmesg -T | grep i915
[Thu Jan 18 15:24:30 2018] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[Thu Jan 18 15:24:30 2018] [drm] Initialized i915 1.6.0 20170619 for 0000:00:02.0 on minor 0
[Thu Jan 18 15:24:31 2018] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[Thu Jan 18 15:24:37 2018] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[Thu Jan 18 16:05:48 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[Thu Jan 18 16:07:26 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[Thu Jan 18 16:29:20 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[Thu Jan 18 16:29:22 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[Thu Jan 18 16:29:56 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[Thu Jan 18 16:31:29 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[Thu Jan 18 16:31:37 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[Thu Jan 18 16:35:19 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Not sure what's the workaround. I don't see the problem when I use
laptop's display.
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[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Angelo Lisco]

Same issue here on a Lenovo T450s with a Intel HD Graphics 5500 (Broadwell GT2) GPU. It happens both with Ubuntu 16.04 and Fedora (26 and 27) so I suppose that's a weird bug in the intel driver.
It also happens sometimes without any external monitor when I leave my notebook powered up during the night: in the moring my gdm lock screen flickers and I'm unable to login into my session.
Has someone found a workaround or a fix?
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[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Tomasz Przybysz]

I'm currently at kernel version 4.14.11 and the intel firmware drivers installed from
https://01.org/linuxgraphics/downloads/firmware
which are:
kbl_guc_ver9_14.bin
bxt_guc_ver8_7.bin
kbl_dmc_ver1_01.bin

And the bug is still there. Although it wasn't manifesting itself until
I've connected an external screen (may coincidence though).

@Angelo Lisco
Not sure will it help in your case but have you tried setting kernel boot flag?
i915.enable_rc6=0

It's workaround not a fix, I'm afraid.
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[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[David JM Emmett]

I keep experiencing this issue, using Ubuntu 17.10, an Intel Core
i3-5005U (with Intel HD 5500). It appears most often when a new
notification comes in (Slack/Spotify) and the lockscreen is visible.
[Fri Feb 23 13:51:50 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

$ uname -a
Linux uk-it-033 4.13.0-36-generic #40-Ubuntu SMP Fri Feb 16 20:07:48 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

If you need any further information, please let me know.
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Willem Hobers]

I'm testing Xubuntu 18.04 and have the same message in kern.log:

Mar 15 17:26:21 Xubuntu-18-04 kernel: [ 543.782137]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun

I have experienced some "weird" screens.Please have a look here:
Loading Image...

Running uname -a gives:

Linux Xubuntu-18-04 4.15.0-12-generic #13-Ubuntu SMP Thu Mar 8 06:24:47
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Please let me know if you need more information.
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Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Chen-Han Hsiao (Stanley)]

For Intel GLK user: There is a upstream bug opened and fixed:
https://bugs.freedesktop.org/show_bug.cgi?id=100302

And this patch works for me on Intel Gemini Lake platform:
https://github.com/torvalds/linux/commit/ed69cd40685c949ec9c65701758bbf9e6840240f

This patch is merged starting from v4.15-rc1

** Bug watch added: freedesktop.org Bugzilla #100302
https://bugs.freedesktop.org/show_bug.cgi?id=100302
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[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Sergei Mikhailov]

@Tomasz Przybysz
i915.enable_rc6=0 as a workaround doesn't seem to work.

I have similar symptoms as Angelo Lisco. I leave laptop on overnight and
sometimes in the morning it got frozen with same underrun error message
in logs.

enable_rc6 is definitely set to 0:
$ cat /sys/class/drm/card0/power/rc6_enable
0

And the bug is still there with kernel 4.15.10 =( just a heads up
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[Will Foster]

This still occurs for me on kernel 4.15.12.
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[Myna Mefirst]

Like others, this still occurs on 4.15.13-041513-lowlatency with a clean
install of 16.04.

However, please note: It ONLY occurs if I am connected from my laptop's
docking station (HP 840 G2) to an external monitor (HDMI or DVI same
issue), AND the laptop lid is DOWN.

If the above is true i get the same error, or the funny graphics, etc.

However, if i keep the laptop lid OPEN, even though i am still connected
to the external screen, i have NO problem booting up.
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[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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[Will Foster]

For me this manifests in lockups. The hardware buttons on my laptop
still work, fans etc. but xorg basically hard locks (Kernel 4.15.12)
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[Will Foster]

For me this manifests in lockups. The hardware buttons on my laptop
still work, fans etc. but xorg basically hard locks (Kernel 4.15.12).
There is no monitor in play.
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[Oli]

I am running Ubuntu 18.04 since about a month. No problems so far, until i made an update 2 or 3 days ago. Since then i have the same problem. Messages in dmesg with underrun, flickering screen etc.
It happens all the time. This happens on my htpc so i am not able to watch TV longer than 5-10 minutes, then it starts again with flickering.
I also tried that rc6_enable-workaround, did not help.
Any help is appreciated!
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