https://bugs.freedesktop.org/show_bug.cgi?id=30620
--- Comment #5 from Alex Deucher agd5f@yahoo.com 2010-10-05 10:42:02 PDT --- Everything looks correct. Can you dump the regs using radeontool with kms and with radeonfb? As root: with radeonfb: radeontool regmatch '*' > working.regs with kms: radeontool regmatch '*' > broken.regs
You can get radeontool here: http://cgit.freedesktop.org/~airlied/radeontool/