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[Felix Engemann <761065@xxxxxxxxxxxxxxxxxx>]

Ok forget the post above. Seems to have nothing to do with this bug.

On Kernel 2.8.38: /sys/module/i915/parameters/semaphores is set to 0
On Kernel 2.8.39: /sys/module/i915/parameters/semaphores is set to 1

if i do the following:

sudo -i
echo 1 > /sys/module/i915/parameters/semaphores

The Bug is also gone on 2.8.38 .....

If i set semaphores on 2.8.39 to 0 as it is default on 2.8.38, the bug
also appears.

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https://bugs.launchpad.net/bugs/761065

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