No change with linus git rc3 as of today + drm-fixes-3.8  with mesa at
e09a5846cdab01a3bf04ac8c11e352d85b89b4af and -ati at
102ee4a24e4c9ba0c0b65d3ca8599dc7e0216c1e. It floods the dmesg after login and
computer freezes.

I tried switching to gdm but i dont't even get to the login screen, computer
freezes.

I tried openbox, i was able to login and ran glxgears, some 3d screensavers but
the computer froze when i tried some webgl demos. I saw a couple of:
radeon: The kernel rejected CS, see dmesg for more information
in the terminal and the same dmesg flood and the computer freezes.