Option "DmaType" "PCI" also helps, I could run glxgears and many GL screensavers. But I sometimes had small garbage squares in the top left corner, maybe like those mentioned in the upstream bug, and eventually it crashed (full freeze).
-- drm crash, possibly because of savage video-driver https://launchpad.net/bugs/37218 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
