If your nVidia card is g80-based, you may be able to do this with xrandr. If you prefer using the old Xinerama behavior, you'll need to downgrade your -ati driver to version 6.6.3 (the version from Feisty).
** Changed in: xorg (Ubuntu) Status: New => Won't Fix -- xorg.conf multiple monitor failure https://bugs.launchpad.net/bugs/145276 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs