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[David Coggins <727594@xxxxxxxxxxxxxxxxxx>]

The system froze for me testing the latest natty 2.6.38-7.36 which
should incorporate the fix for bug 717114

drm/i915: Fix tiling corruption from pipelined fencing

Mar 21 11:29:13 eee kernel: [    0.000000] Linux version
2.6.38-7-generic (buildd@roseapple) (gcc version 4.5.2 (Ubuntu/Linaro
4.5.2-6ubuntu4) ) #36-Ubuntu SMP Fri Mar 18 22:05:25 UTC 2011 (Ubuntu
2.6.38-7.36-generic 2.6.38)

Mar 21 11:47:30 eee kernel: [ 1115.992048] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Mar 21 11:47:30 eee kernel: [ 1115.998408] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 110179 at 110177, next 110180)

Apport is not generating a problem popup when I next reboot at the moment. 
A small amount of testing with the terminal does not show any corruption which I was seeing 2 weeks ago bug 717114

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https://bugs.launchpad.net/bugs/727594

Title:
  [i915gm] GPU lockup (ESR: 0x00000001 IPEHR: 0x02000004)