Comment 31 for bug 565407

I solved by re-installing the proprietary binary from Ati (download from site v. 10.4), and doing 3/4 times Aticonfig initialisation (" aticonfig --initial -f").

I don't know why, but the "3 times" initialisation (it consist on writing a new autoconfiguration on xorg.conf) was my solution (with only 1 initialisation, 3D was not working at all). Hope it helps someone with the same problem.