A month has gone by without reproduction, so let's give it another
couple then retire the bug. The heart of the issue I believe is a race
with GPU reset, of which there are more patches that have gone into
v3.9.

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Triaged => Incomplete

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https://bugs.launchpad.net/bugs/1117563

Title:
  X hard lockup in raring, can't even switch VTs

Status in “xserver-xorg-video-intel” package in Ubuntu:
  Incomplete

Bug description:
  After an upgrade to raring, I've experienced a bug where firefox and X
  are each consuming a CPU doing nothing useful.  When this happens, I
  can still log into the machine remotely with no problems, but the
  console is completely frozen.  The X cursor doesn't move, unity
  doesn't respond, windows are not refreshing, and I can't even change
  VTs (from the keyboard, or over ssh - if I run 'sudo chvt 1', it
  hangs).

  It appears that X and firefox are both busy, but strace of firefox
  shows no output.  kill -9 of the firefox process also has no effect
  (bug #1117499).  There is nothing logged in dmesg or in the X log that
  seems relevant.

  After debugging this for about an hour, the firefox process spontaneously 
died, at which point X also stopped monopolizing the CPU; but the console was 
still frozen,  A few minutes later, the VT switch request seems to have 
registered and I wound up on VT1.  However, switching back to VT7 does not 
result in the screen being refreshed, and 'sudo chvt 1' again hangs.
  ---
  ApportVersion: 2.8-0ubuntu4
  Architecture: amd64
  DistroCodename: raring
  DistroRelease: Ubuntu 13.04
  DistroVariant: ubuntu
  InstallationDate: Installed on 2010-09-24 (866 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 
(20100816.1)
  MarkForUpload: True
  Package: xorg-server (not installed)
  ProcVersionSignature: Ubuntu 3.8.0-4.8-generic 3.8.0-rc6
  Tags:  raring running-unity ubuntu
  Uname: Linux 3.8.0-4-generic x86_64
  UpgradeStatus: Upgraded to raring on 2013-01-25 (12 days ago)
  UserGroups: adm admin cdrom dialout libvirtd lpadmin mythtv plugdev 
sambashare src sudo
  ---
  ApportVersion: 2.8-0ubuntu4
  Architecture: amd64
  CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,imgpng,snap,place,grid,resize,regex,mousepoll,gnomecompat,unitymtgrabhandles,vpswitch,move,animation,expo,session,wall,ezoom,staticswitcher,workarounds,fade,scale,unityshell]
  DistUpgraded: 2013-01-25 08:16:10,776 WARNING no activity on terminal for 300 
seconds (Configuring texlive)
  DistroCodename: raring
  DistroRelease: Ubuntu 13.04
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 02) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:215a]
  InstallationDate: Installed on 2010-09-24 (866 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 
(20100816.1)
  MachineType: LENOVO 3249CTO
  MarkForUpload: True
  Package: xorg 1:7.7+1ubuntu4
  PackageArchitecture: amd64
  PlymouthDebug: Error: [Errno 13] Permission denied: 
u'/var/log/plymouth-debug.log'
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-4-generic 
root=/dev/mapper/hostname-root ro quiet splash --verbose vt.handoff=7
  ProcVersionSignature: Ubuntu 3.8.0-4.8-generic 3.8.0-rc6
  Tags:  raring running-unity ubuntu single-occurrence
  Uname: Linux 3.8.0-4-generic x86_64
  UpgradeStatus: Upgraded to raring on 2013-01-25 (12 days ago)
  UserGroups: adm admin cdrom dialout libvirtd lpadmin mythtv plugdev 
sambashare src sudo
  dmi.bios.date: 08/23/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET52WW (1.22 )
  dmi.board.name: 3249CTO
  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:bvr6QET52WW(1.22):bd08/23/2010:svnLENOVO:pn3249CTO:pvrThinkPadX201:rvnLENOVO:rn3249CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 3249CTO
  dmi.product.version: ThinkPad X201
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.9~daily13.01.25-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.41-0ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.2-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.2-0ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.19-0ubuntu3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.6-0ubuntu2
  xserver.bootTime: Mon Feb  4 17:31:16 2013
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.13.2-0ubuntu1

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