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[Dan Doel <dan.doel@xxxxxxxxx>]

I have, I think, a reliable way to trigger this behavior, if that helps.
It requires a non-trivial setup, though.

I have gnome-shell running on dual monitors. The first is 1920x1200, the
second is 1920x1080 (not sure if the resolution difference matters). If
I run a full-screen game on The 1920x1200 monitor, I get freezes, and
notes in the dmesg about hangcheck timers and kickrings ("stuck wait on
blitter ring").

I believe OpenGL acceleration of the desktop is important, because the
freezes are not triggered in fluxbox, for instance. I'm not sure if the
game itself needs to be using OpenGL, or if the full-screen window is
the triggering factor, or something else entirely. It is important that
the game keep the monitors distinct, and only go full screen on one. I
just tried it on Battle for Wesnoth, and full screen there sets the
monitors to mirror, which doesn't trigger the problem.

This is on an i7 4770, if that matters.

I realize this is may be difficult to put together for a test setup, but
I thought I'd mention it.

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https://bugs.launchpad.net/bugs/1041790

Title:
  [snb] GPU lockup  IPEHR: 0x0b160001 IPEHR: 0x0b140001, workaround
  i915.semaphores=0

Status in X.org xf86-video-intel:
  Confirmed
Status in “linux” package in Ubuntu:
  Confirmed
Status in “sandybridge-meta” package in Ubuntu:
  Confirmed
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Triaged

Bug description:
  X locks up periodically for a 2 to ten seconds at a time and this
  crash log gets generated. It's significantly more than several times a
  day but not quite continuous.

  Temporarily disabiling semaphores seems to eliminate the problem.
  E.g.:

  $ sudo -s
  # echo 0 > /sys/modules/i915/parameters/semaphores

  [Workaround]
  1.  Edit your /etc/default/grub file.
  2.  Change this line:

      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

  to

      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.semaphores=0"

  3.  Then run

      sudo update-grub

  4.  And reboot

  If you indeed have this bug, that should stop the lockups from happening.
  If it doesn't, then file a new bug report.

  Side Effects:  Rendering throughput is dropped by 10% with SNA, or as
  much as 3x with UXA. OpenGL performance is likely to be reduced by
  about 30%. More CPU time is spent waiting for the GPU with rc6
  disabled, so increased power consumption.

  [Original Report]

  ProblemType: Crash
  DistroRelease: Ubuntu 12.10
  Package: xserver-xorg-video-intel 2:2.20.3-0ubuntu1
  Uname: Linux 3.6.0-rc3-git-20120826.1015 x86_64
  ApportVersion: 2.5.1-0ubuntu2
  Architecture: amd64
  Chipset: sandybridge-m-gt2
  Date: Sun Aug 26 16:06:32 2012
  DistroCodename: quantal
  DistroVariant: ubuntu
  DuplicateSignature: [sandybridge-m-gt2] GPU lockup  IPEHR: 0x0b160001 IPEHR: 0x0b140001 Ubuntu 12.10
  EcryptfsInUse: Yes
  ExecutablePath: /usr/share/apport/apport-gpu-error-intel.py
  GpuHangFrequency: Continuously
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120724.2)
  InterpreterPath: /usr/bin/python3.2mu
  MachineType: Dell Inc. Dell System XPS L502X
  ProcCmdline: /usr/bin/python3 /usr/share/apport/apport-gpu-error-intel.py
  ProcEnviron:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.6.0-rc3-git-20120826.1015 root=UUID=135c8090-427c-460a-909d-eff262cd44b6 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   xserver-xorg             1:7.7+1ubuntu3
   libdrm2                  2.4.38-0ubuntu2
   xserver-xorg-video-intel 2:2.20.3-0ubuntu1
  SourcePackage: xserver-xorg-video-intel
  Title: [sandybridge-m-gt2] GPU lockup  IPEHR: 0x0b160001 IPEHR: 0x0b140001
  UdevDb: Error: [Errno 2] No such file or directory: 'udevadm'
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  dmi.bios.date: 05/29/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 0NJT03
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA11:bd05/29/2012:svnDellInc.:pnDellSystemXPSL502X:pvr:rvnDellInc.:rn0NJT03:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L502X
  dmi.sys.vendor: Dell Inc.

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