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[Matthias Schmidt <761065@xxxxxxxxxxxxxxxxxx>]

I see the strange "bsd ring behavior" when using the fix of #18 with my
Thinkpad X220. Added the semaphore option to grub renders my system
unusable. Console is no longer high-res and I only see graphics errors
with X, no chance to work. I get the following error:

[drm:init_ring_common] *ERROR* gen6 bsd ring initialization failed ctl 0001f003 head 00000000 tail 00000000 start 00022000
[drm:i915_driver_load] *ERROR* failed to init modeset

If I boot the system w/o the grub parameter and set it afterwards (via
/sys), it seems to work.

So take care if you put the fix into the grub config.

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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

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