I've just upgraded to the broken DRM and new kernel (rc8) then I copied my previously self-compiled drm.ko from the previous kernel modules and lo and behold I can log in with DRI!
I compiled with this patch: http://www.botchco.com/alex/xorg/0001-radeon-drm-Add-3D-support-on-r6xx-r7xx-chips.patch
So I'm guessing either GIT HEAD or something in that patch fixes it.
I've just upgraded to the broken DRM and new kernel (rc8) then I copied my previously self-compiled drm.ko from the previous kernel modules and lo and behold I can log in with DRI!
I compiled with this patch: http:// www.botchco. com/alex/ xorg/0001- radeon- drm-Add- 3D-support- on-r6xx- r7xx-chips. patch
So I'm guessing either GIT HEAD or something in that patch fixes it.