The Radeon DRI drivers work for the most part on all OpenGL games and demos if you use the Mesa 7.6.x branch.
The ATI Radeon 4850/4870 are reliable graphics hardware for testing with Mesa 7.6.x. Use this as a guidebook: http://www.x.org/wiki/RadeonProgram Ken Mays Blastwave.org Atlanta, GA (USA)
