Of course I haven't got a solution because I don't own that card. I was merely pointing out that your statement "Your problem is the x800xt video card. There is no support for that beast in the open source ati driver" was very strong and maybe not correct since it is actually listed as being supported. It presumably works for somebody? I know nothing about the card, were there non-apple versions of the x800xt?
If I was looking at solutions then I would read the radeon manual. On my hit list would be to turn off kms (radeon.modeset=0). Then I would try between EXA and XAA. I would also set the gart size to half the video memory (or 256, 128, 64, etc). There are lots of other random options to try like "Int10". It's a time consuming process, but just think of the achievement if you do get it to work!
EDIT: If you still can't get it to work then you should probably file a bug and see if you get a response from somebody who knows what they are talking about https://bugs.freedesktop.org/buglist...arch=x800+r420 .



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