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7020100
(Get the code!)
Browsed through the last month's worth of changes to the 7.10 branch for mesa and didn't spot an obvious fix for this issue, however there were several buffer validation patches for radeon, so it wouldn't surprise me if the bug goes away in newer mesa.
If you'd like to test it now, you could install xorg-edgers, which has a packaged snapshot of today's mesa:
https:/
After testing, you can use ppa-purge to restore your system to its pre-edgers state.
Or if you'd prefer, we anticipate the 7.10 final release immanently and expect to have it in natty within the next couple weeks or so.