Comment 2 for bug 812638

David -- What lts-backport-natty kernel were you testing at the time of filing this bug? 2.6.38-10.46~lucid1 was released yesterday, which may of of benefit to test.

This does sound quite similar to Bug #761065, where a fix has landed in 2.6.38.8 -stable, and is now applied to the current natty -proposed kernel (2.6.38-11).

... booting with i915.semaphores=1 as a kernel option on builds <= 2.6.38-10 should work around this issue, which would certainly be a great datapoint.

Regards,
Chris