Since Mesa commit 30257c32910c3f7ac2b9cc24399d6be196d34d26 r600g fails to render anything on Linux 3.3 and probably all earlier versions. An upgrade to 3.4 fixes the issue.
The output from glxinfo is:
radeon: The kernel rejected CS, see dmesg for more information.
This is accompanied by the following lines in dmesg:
[199859.400626] radeon 0000:01:00.0: forbidden register 0x00028b28 at 188
[199859.400628] [drm:radeon_cs_ib_chunk] *ERROR* Invalid command stream !
My understanding is that Mesa is intended to remain backwards compatible with older kernels. If this is not the case feel free to close the bug.
Fixed in mesa master
(In reply to comment #1)
> Fixed in mesa master
Marking this bug as fixed.