https://bugzilla.kernel.org/show_bug.cgi?id=31972
--- Comment #2 from Arkadiusz Miskiewicz arekm@maven.pl 2011-03-27 21:00:41 --- Created an attachment (id=52212) --> (https://bugzilla.kernel.org/attachment.cgi?id=52212) dmesg with drm debug=1
Not a regression since 2.6.37 didn't support this card at all.
Bad cable... I forgot to mention one important thing. Video card is not connected directly to toshiba tv but through pioneer vsx-920-k amplifier. I just did a test and connected directly to tv. The problem is gone.
So pioneer could be suspected for dirty games but there is no problem with windows working in the same setup (I use 1920x1080 in windows; some gpu hungry games like call of duty 4 etc work fine in this setup), so there is a chance for a radeon drm bug.
dmesg with debug attached.