Formerly this firmware was OSS and as far as I can remember it had always been
working while the firmware had been OSS. Alex, it would be very nice if you
could give me a hint from where on I should start to test. From which point in
time on was there a non-OSS firmware in use for radeon? Note that it still
works without this firmware. Maybe I do not need to bisect Xorg but very likely
just the firmware.