I have a similar problem with my ATI X800XT card. If I connect my TFT to the analog Output of the graphic card everything is fine apart of wrong colors. Well this can be corrected, but is not necessary using the DVI Output of the card. I tried also to change the graphic settings so that the virtually secondary card (DVI Port) is used without any success.
-- [X600] Black screen with DRI https://launchpad.net/bugs/35601 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
