With semaphore set to "0" on 2.6.39-0.5~20110427:

[ 5136.145217] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer 
elapsed... blt ring idle [waiting on 1132622, at 1132622], missed IRQ?
[ 5382.346399] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer 
elapsed... blt ring idle [waiting on 1242913, at 1242913], missed IRQ?
[ 5551.951435] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer 
elapsed... blt ring idle [waiting on 1327817, at 1327817], missed IRQ?

It's actually easy to reproduce this (at least on my system): just click
the ubuntu menu in the upper left corner, and start typing in the search
box until the UI freezes for 1-2 seconds.

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/761065

Title:
  [Sandybridge] Spurious "*ERROR* Hangcheck timer elapsed... blt ring
  idle" messages in dmesg when using compiz

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