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[HAL 9000 <805586@xxxxxxxxxxxxxxxxxx>]

I'm having the same problem on oneiric. The screen randomly freezes for
a few seconds (the mouse still moves, but everything else is dead), then
everything turns black for a second, and then it all goes back to
normal. Afterwards, I find this in my syslog:

[  200.319085] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
[  200.319094] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
[  200.330227] [drm:i915_wait_request] *ERROR* i915_wait_request returns -11 (awaiting 31970 at 31965, next 31971)
udevd[3721]: failed to execute '/usr/share/apport/apport-gpu-error-intel.py' '/usr/share/apport/apport-gpu-error-intel.py': No such file or directory
[  200.405176] [drm:ironlake_update_pch_refclk] *ERROR* enabling SSC on PCH
[  200.700351] [drm:ironlake_update_pch_refclk] *ERROR* enabling SSC on PCH

The "enabling SSC on PCH"-error also appears randomly from time to time,
but I don't notice it otherwise.

Also, it only seems to occur when I have my second screen connected.

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https://bugs.launchpad.net/bugs/805586

Title:
  i915 Hangcheck timer elapsed... GPU hung

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