https://bugs.freedesktop.org/show_bug.cgi?id=76490
--- Comment #32 from Alex Deucher alexdeucher@gmail.com --- (In reply to Gustavo Lopes from comment #31)
I'm using 4.0-rc1 and the radeon module now works, but it hangs once or twice a day, something I did not experience with catalyst. It seems to be more frequent under load.
Does it help if you limit the clock to something lower than 1200Mhz?