https://bugs.freedesktop.org/show_bug.cgi?id=60879
--- Comment #20 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #19)
(In reply to comment #18)
Actually the GPU only works if it has been initialized by fglrx and then the driver is switched to radeon without rebooting. When booting with radeon it doesn't work.
Can you dump the registers with avivotool (http://cgit.freedesktop.org/~airlied/radeontool/) from both radeon and fglrx? E.g., cold boot with radeon and dump the registers: sudo avivotool regmatch '*' > radeon.regs then boot with fglrx and switch radeon: sudo avivotool regmatch '*' > fglrx.regs and post the outputs here?
Actually, three outputs would be better: 1. cold boot with radeon 2. cold boot with fglrx 3. cold boot with fglrx, warm boot radeon