Braswell: CPU pipe C FIFO underrun when mouse pointer changes display

[Sergiu Sincan]

Machine is a HP 250 G4 notebook with Celeron N3050, with BIOS F.1A Rev.A (latest).

When I add a external display (VGA, 1920x1080@60Hz), sometimes when I cross over to it with the mouse cursor, it flickers (turns off for about 1-2 seconds), and I get:
[ 692.452293] [drm:intel_cpu_fifo_underrun_irq_handler [i915_bpo]] *ERROR* CPU pipe C FIFO underrun.
It will do this for 2-3 times, and then it will turn off completely (external display has no VGA signal).

Also reproduces with Kubuntu 15.10 (in Live mode).

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xserver-xorg-video-intel-lts-vivid 2:2.99.917-1~exp1ubuntu2.2~trusty1
ProcVersionSignature: Ubuntu 3.19.0-42.48~14.04.1-generic 3.19.8-ckt10
Uname: Linux 3.19.0-42-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Dec 24 10:03:17 2015
InstallationDate: Installed on 2015-12-23 (0 days ago)
InstallationMedia: Kubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: xserver-xorg-video-intel-lts-vivid
UpgradeStatus: No upgrade log present (probably fresh install)
---
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: srj 2051 F.... pulseaudio
CurrentDesktop: KDE
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=f02a8c10-0cdd-4881-962b-86301eb89a58
InstallationDate: Installed on 2015-12-23 (23 days ago)
InstallationMedia: Kubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: Hewlett-Packard HP 250 G4 Notebook PC
NonfreeKernelModules: wl
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-43-generic.efi.signed root=UUID=4ce84895-a22a-4619-9dac-e2f82a3add95 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.19.0-43.49~14.04.1-generic 3.19.8-ckt10
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-43-generic N/A
 linux-backports-modules-3.19.0-43-generic N/A
 linux-firmware 1.127.19
Tags: trusty
Uname: Linux 3.19.0-43-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 09/10/2015
dmi.bios.vendor: Insyde
dmi.bios.version: F.1A
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 80C5
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 97.40
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.1A:bd09/10/2015:svnHewlett-Packard:pnHP250G4NotebookPC:pvrType1ProductConfigId:rvnHewlett-Packard:rn80C5:rvr97.40:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP 250 G4 Notebook PC
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: Hewlett-Packard

[Sergiu Sincan (sergiu-sincan)]

I think this may be related to https://bugs.freedesktop.org/show_bug.cgi?id=92826

[Sergiu Sincan (sergiu-sincan)]

I've patched linux-lts-vivid-3.19.0/ubuntu/i915/intel_display.c and linux-lts-vivid-3.19.0/drivers/gpu/drm/i915/intel_display.c with the change presented in http://lists.freedesktop.org/archives/intel-gfx/2015-December/083563.html and the issue does not reproduce. However, the behaviour of the cursor at the left edge of the second screen is sub-optimal.

[penalvch (penalvch)]

Sergiu Sincan, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1529020

[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Sergiu Sincan (sergiu-sincan)]

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[Brad Figg (brad-figg)]

This change was made by a bot.

[penalvch (penalvch)]

Sergiu Sincan, regarding https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1529020/comments/3 that patch was subsequently declined by upstream.

Despite this, at your earliest convenience, could you please test the latest upstream kernel available from the very top line at the top of the page from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D (the release names are irrelevant for testing, and please do not test the daily folder)? Install instructions are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds . This will allow additional upstream developers to examine the issue.

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.