Created attachment 115626 [details]
dmesg drm debug kernel 3.18

I am also interested in providing help to fix this bug.

I even tried to bisect it, but I somehow didn't quite unterstand, how to
reproduce the working case, so it didn't give me any interesting results.

I'm attaching a log of my new setup using gentoo, before I switched to fglrx.
It's from kernel 3.18 (current stable in gentoo) and was produced after booting
with nomodeset and unloading radeon, drm etc
then doing
modprobe -v drm debug=1
modprobe -v radeon modesetting=1

then printing dmesg to a file.

Greetings,
Nicolas