https://bugs.freedesktop.org/show_bug.cgi?id=44919
--- Comment #10 from Scott Moreau oreaus@gmail.com 2012-01-24 07:56:34 PST --- (In reply to comment #9)
Possible fix: http://lists.freedesktop.org/archives/mesa-dev/2012-January/018029.html
I tested this patch and it solves the issue with weston clients here on r300g. Thanks Alex.