I had the same issue with an ATI X700 Pro in my desktop. I've solved it changing "ati" to "radeon" in /etc/X11/xorg.conf
-- desktop-cd ubuntu 6.10 beta boots but 'blank screen' only https://launchpad.net/bugs/64502 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
