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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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

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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:
  Confirmed

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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