https://bugs.freedesktop.org/show_bug.cgi?id=36227
--- Comment #1 from Jerome Glisse glisse@freedesktop.org 2011-04-14 07:44:13 PDT --- Please boot in runlevel 3 (add 3 to your kernel boot line) to avoid starting X, unloading the radeon non kms module might let the hw in fuzzy state.
Once booted in run level 3 load radeon with the modeset=1 and attach the new kernel log here