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[James Ferguson <1366876@xxxxxxxxxxxxxxxxxx>]

Is there any chance of this bug going anywhere?  I'm happy to help
diagnose.

It still happens to me 5+ times a week, and on two different laptops
(both Lenovo X230).  Sometimes it just hangs - most recently today the
only thing in syslog was:

kernel: [522947.074816] [drm] stuck on render ring

In that case it only froze for about 10s.

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https://bugs.launchpad.net/bugs/1366876

Title:
  Xorg freeze

Status in “xorg” package in Ubuntu:
  New

Bug description:
  Desktop display freezes temporarily, for (approx) 20s or so, approx
  once a day, with mouse pointer still working.  After that it comes
  back and resumes as normal, seemingly replaying mouse and keyboard
  events from the meantime.  I think it's always happened when using
  Google Chrome (Stable - currently 37.0.2062.94, but I think other
  recent versions).  The desktop is completely unresponsive

  This didn't seem to happen until a few weeks ago.  I tend to pull
  updates fairly regularly.

  In syslog there is:

  kernel: [277415.130771] [drm] stuck on render ring

  I suspect this is a dupe since I see other related bugs, but you'd be
  better placed to decide that than I.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,resize,place,grid,vpswitch,gnomecompat,mousepoll,session,move,obs,imgpng,snap,regex,animation,expo,ezoom,staticswitcher,workarounds,wall,fade,scale]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Mon Sep  8 12:22:27 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus: comedi-adv-pci1724, 0.0.1: added
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Several times a week
  GpuHangReproducibility: Seems to happen randomly
  GpuHangStarted: Since a couple weeks or more
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:21fa]
  InstallationDate: Installed on 2014-07-11 (59 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 2306CTO
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=UUID=561b4b77-cac6-4abb-a89e-ecf7f1bb8f42 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/11/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET82WW (2.02 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2306CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ET82WW(2.02):bd09/11/2012:svnLENOVO:pn2306CTO:pvrThinkPadX230:rvnLENOVO:rn2306CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2306CTO
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Thu Sep  4 16:58:14 2014
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                 728
   vendor                                     LGD
  xserver.version: 2:1.15.1-0ubuntu2.1

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