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[Felix Engemann <761065@xxxxxxxxxxxxxxxxxx>]

Thx for the new Kernel AceLan!

I tested the x86_64 version on two different Boards. It got a little better I think - bug happens not that frequently imho. 
But still, if I e.g. press alt-f2 in Unity and start typing I still get lags and dmesg shows: 

[   85.166147] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 39358, at 39358], missed IRQ?
[   88.283088] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 40776, at 40776], missed IRQ?
[  109.272320] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 56389, at 56389], missed IRQ?
[  111.370250] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 56943, at 56943], missed IRQ?

It's better reproducible if you play some opengl game. e.g. neverball.

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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