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[CB <1479321@xxxxxxxxxxxxxxxxxx>]

If my memory doesn't fail me, it occurred since when I've got this
machine and it had Ubuntu 14.04 or 14.04.1.

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https://bugs.launchpad.net/bugs/1479321

Title:
  WARNING: CPU: 1 PID: 207 at /build/linux-lts-vivid-3x86XO/linux-lts-
  vivid-3.19.0/drivers/gpu/drm/i915/intel_display.c:958

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Every now and than my desktop freezes for a couple of minutes.  I can
  move the mouse pointer but it gets stuck in a single display (I have
  two).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.16.0-45.60~14.04.1-generic 3.16.7-ckt14
  Uname: Linux 3.16.0-45-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.11
  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 Jul 29 08:38:07 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 4.3.10, 3.16.0-43-generic, x86_64: installed
   virtualbox, 4.3.10, 3.16.0-45-generic, x86_64: installed
  ExtraDebuggingInterest: I just need to know a workaround
  GpuHangFrequency: Several times a week
  GpuHangReproducibility: Seems to happen randomly
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:339a]
  InstallationDate: Installed on 2015-04-10 (109 days ago)
  InstallationMedia: It
  MachineType: Hewlett-Packard HP Compaq Pro 6300 MT
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-45-generic root=UUID=88d8ecda-fb83-4942-83db-bbb2ee83be80 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/16/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: K01 v02.90
  dmi.board.asset.tag: BRJ40510V4
  dmi.board.name: 339A
  dmi.board.vendor: Hewlett-Packard
  dmi.chassis.asset.tag: BRJ40510V4
  dmi.chassis.type: 6
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrK01v02.90:bd07/16/2013:svnHewlett-Packard:pnHPCompaqPro6300MT:pvr:rvnHewlett-Packard:rn339A:rvr:cvnHewlett-Packard:ct6:cvr:
  dmi.product.name: HP Compaq Pro 6300 MT
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri N/A
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Wed Jul 29 08:19:44 2015
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        CHICONY HP Basic USB Keyboard KEYBOARD, id 8
   input        PixArt USB Optical Mouse MOUSE, id 9
   input        HP WMI hotkeys       KEYBOARD, id 10
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               12387 
   vendor                                     HWP
  xserver.version: 2:1.16.0-1ubuntu1.2~trusty2

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