It's been suggested in the upstream bug that this patch will fix things:

http://git.kernel.org/?p=linux/kernel/git/stable/stable-
queue.git;a=blob;f=queue-2.6.33/drm-radeon-kms-fix-rs600-tlb-
flush.patch;h=ae28c673b414ac50a93a9d4e41d35e787b0e6a94;hb=HEAD

Note that the patch is already in the stable queue. When the next stable
drop occurs it will include this patch. That will likely be included in
the next Ubuntu kernel release as well.

I've uploaded a test kernel to
http://people.canonical.com/~cndougla/505808/tlb-flush/. Please test it
out to ensure it fixes this issue.

Thanks

-- 
Can't boot with last linux kernels from 2.6.32.10
https://bugs.launchpad.net/bugs/505808
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