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[bhat3 <bhat3@xxxxxxxxxxxxx>]

@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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https://bugs.launchpad.net/bugs/1550779

Title:
  [i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  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

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