https://bugs.freedesktop.org/show_bug.cgi?id=36327
--- Comment #2 from Alex Deucher agd5f@yahoo.com 2011-04-17 10:11:28 PDT --- Removing i2c-algo-bit.ko prevents radeon from loading since it depends on it; that's why 3D/compositing fail. Please attach your xorg log and dmesg output both with and without i2c-algo-bit.ko present.