I still have not experienced a single GPU hang since I added the options 
"i915.i915_enable_rc6=0 i915.i915_enable_fbc=0" to the grub command line. This 
website mentions problems which might relate to what some people in this forum 
are experiencing:
http://intellinuxgraphics.org/2011Q4.html
In particular, I wonder if the "i915.semaphores=1" kernel option can help 
anybody here, as nobody has suggested it before.

This might be a useful read as well:
http://www.phoronix.com/scan.php?page=article&item=intel_i915_power

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https://bugs.launchpad.net/bugs/993187

Title:
  ubuntu 12.04 completely freezes frequently.

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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/993187/+subscriptions

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