kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

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.

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

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

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https://bugs.launchpad.net/bugs/1529020

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

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  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

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