Also happens here with AIGLX and only works for me at 1024x768 (although my display supports up to 1400x1050) with an ati mobility 9000 with the radeon driver.
-- Radeon 9000 and XGL reports "No screens found" at high resolutions https://launchpad.net/bugs/42527 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
