doing what Felix proposed at #16 didn't work on natty (2.6.38-8-generic):
# echo 1 > /sys/module/i915/parameters/semaphores
-bash: echo: write error: Invalid argument
However, doing what proposed on #18 solved the problem.
XPS L502X with optimus/bumblebee working
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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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