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[Noccy <noccy@xxxxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 528467 ***
    https://bugs.launchpad.net/bugs/528467

Same problem with with the 2.6.34 kernel from kernel.ubuntu.com. Display
locks up randomly, text mode flashes a few times, and then gives me a
message about Ubuntu running in low graphics mode. Only solution to get
X back up is to reboot.

Last time encountered was when I tried to launch OsmosDemo.

$ cat kern.log | grep -i i915
Jun  3 03:24:36 noccy-laptop kernel: [   31.371500] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
Jun  3 03:24:36 noccy-laptop kernel: [   31.371515] i915 0000:00:02.0: setting latency timer to 64
Jun  3 03:24:36 noccy-laptop kernel: [   32.098461] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
Jun  3 03:49:12 noccy-laptop kernel: [ 1507.968078] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Jun  3 03:49:12 noccy-laptop kernel: [ 1507.968419] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 79853 at 79852)

$ uname -a
Linux noccy-laptop 2.6.34-020634-generic #020634 SMP Mon May 17 20:34:55 UTC 2010 i686 GNU/Linux

No errors in Xorg.log

-- 
display freezes, [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
https://bugs.launchpad.net/bugs/507504
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which is the registrant for xf86-video-intel (via bug 528467).