https://bugs.freedesktop.org/show_bug.cgi?id=60879

--- Comment #19 from Alex Deucher <agd5f@yahoo.com> ---
(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?

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