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[Josh Glover <1041790@xxxxxxxxxxxxxxxxxx>]

I am also experiencing this, on a Gentoo system running on a ThinkPad
T440s. I'm not doing anything related to XBMC, simply using xrandr for
multihead. The interesting thing is that DRI works fine on my laptop
screen (glxgears reports 60fps, which is the refresh rate of my screen),
but breaks when I move a window trying to use DRI (e.g. Chrome,
glxgears) to the external monitor connected to the mini Display Port
output.

I see this stuff in dmesg:

[ 3561.424762] [drm:ring_stuck] *ERROR* Kicking stuck wait on blitter ring
[ 3561.424770] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[ 3561.424772] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[ 3561.424774] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[ 3561.424776] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[ 3561.424778] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[ 3566.422957] [drm:ring_stuck] *ERROR* Kicking stuck wait on blitter ring
[ 3571.425143] [drm:ring_stuck] *ERROR* Kicking stuck wait on blitter ring
[ 3575.423680] [drm:ring_stuck] *ERROR* Kicking stuck wait on blitter ring

Seems like the same issue. I'm trying to downgrade X, mesa, et al., to
try and get the system back in working order.

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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:
  In Progress
Status in “linux” package in Ubuntu:
  Incomplete
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. If you indeed have this bug, that should
  stop the lockups from happening. Irrespective, please file a new bug
  report so your hardware may be tracked.

  WORKAROUND: Edit your /etc/default/grub from:
  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

  to:
  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.semaphores=0"

  run the following and reboot:
  sudo update-grub

  The side effects of this is 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.

  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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