https://bugs.freedesktop.org/show_bug.cgi?id=30188
--- Comment #16 from Alex Deucher agd5f@yahoo.com 2010-10-06 17:14:30 PDT --- This might be an issue with non-cpu accessible vram. Do you still see the issue with the drm-next or drm-radeon-testing branches of Dave's drm tree?
Specifically, make sure your kernel has this patch: http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commitdiff;h...