This problem seems to be related to KMS in 2.6.32:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/549989

(several similar reports can be found on other distro's bugtrackers)

Either disabling KMS entirely (i915.modeset = 0 in /etc/defaults/grub)
or disabling the powersave option (i915.powersave = 0) solves the
problem. It looks like a kernel bug in 2.6.32.

Please feel free to reassign or close this bug report as appropriate.



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