Covered, but never solved. I also don't want to use DRI because in the latest Phoronix comparision between DRI and the official ATi drivers there was up to 20fps boost in the official ATI drivers.
The only reasonable fix would be buying a nVidia card, but there must be a way to get this working because with Xandros I could play Unreal Tournament 2004 and Quake 3 without a problem.