Ah, I forgot to mention that I installed also the most recent drivers from the xorg-edgers PPA, but that didn't helped. And also I'm having problems when I boot (GDM doesn't start). I'm attaching the Xorg.1.log file, and I see that there is an error parsing the config file (?). I'll install Beta 2 to see if something has changed, including this strange error.
** Attachment added: "Xorg.1.log" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/755791/+attachment/2076675/+files/Xorg.1.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/755791 Title: [RS690M] No 3d acceleration in Radeon X1200 with new Gallium r300 / 3d drivers in 11.04 Beta 1 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs