https://bugs.freedesktop.org/show_bug.cgi?id=63865
--- Comment #4 from Alex Deucher agd5f@yahoo.com --- Created attachment 78471 --> https://bugs.freedesktop.org/attachment.cgi?id=78471&action=edit Possible fix
The attached patch should fix it, but I don't see how any kernel ever would have worked with your card. Did you change any bios settings or flash your bios recently?