https://bugs.freedesktop.org/show_bug.cgi?id=27507
--- Comment #5 from Marek Olšák maraeo@gmail.com 2010-09-11 21:38:25 PDT --- Could you possibly test this kernel patch:
http://lists.freedesktop.org/archives/dri-devel/2010-September/003830.html
And please let me know if it fixes 0ad for you.
You might also try the Gallium driver instead in case the patch doesn't help.
dri-devel@lists.freedesktop.org