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[Trent Lloyd <trent.lloyd@xxxxxxxxxxxxx>]

Further debugging, I discovered that the screen blanking issue was being
caused by a faulty power supply on the DisplayPort Expander/Splitter, it
kept resetting.  This was causing the errors.

** Changed in: xorg (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1531422

Title:
  i915 underrun errors causing screen blanking

Status in xorg package in Ubuntu:
  Invalid

Bug description:
  I am having issues with my displays blanking out and coming back after
  2 seconds, quite often.. sometimes a few times in 10 seconds sometimes
  once a minute.  I only just started using the Intel graphics today,
  instead of previously using a radeon card.

  My setup is 1xDVI + 1x Displayport, with a powered mulitlink adaptor
  to then connect 2 displays.  Only the displayport displays blank out.

  Similar errors to reported in #1451632 -- I am running xenial up to
  date as of today, 4.3.0-5-generic.

  These errors keep appearing, but lots of other stuff is also
  appearing.  A bunch more occurred since I ran ubuntu-bug to generate
  all the xorg data, so i'll attach an extra dmesg log.

  [ 4143.345679] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe C
  [ 4143.345688] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe C FIFO underrun

  
  Did not happen first at boot, but once it started didn't stop happening.  Was playing video at the time but pausing it didn't seem to stop it.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+12ubuntu1
  ProcVersionSignature: Ubuntu 4.3.0-5.16-generic 4.3.3
  Uname: Linux 4.3.0-5-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19.3-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed Jan  6 16:01:45 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd Device [1458:d000]
  InstallationDate: Installed on 2015-11-13 (53 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Gigabyte Technology Co., Ltd. Z97X-Gaming G1 WIFI-BK
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.3.0-5-generic.efi.signed root=UUID=79f3ac61-fbba-43f5-ae15-30b248bad5fe ro rootflags=subvol=@ quiet splash crashkernel=384M-:128M vt.handoff=7
  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: 04/21/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F7
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z97X-Gaming G1 WIFI-BK
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF7:bd04/21/2015:svnGigabyteTechnologyCo.,Ltd.:pnZ97X-GamingG1WIFI-BK:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ97X-GamingG1WIFI-BK:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: Z97X-Gaming G1 WIFI-BK
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.12.2+16.04.20151211-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.65-3
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.7-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.7-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20151217-1~exp1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Wed Jan  6 14:57:22 2016
  xserver.configfile: default
  xserver.errors: systemd-logind: failed to get session: PID 1561 does not belong to any known session
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.17.3-2ubuntu2

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