Shouldn't the option Option "XAANoOffscreenPixmaps" have a "true" in your xorg.conf ?
** Changed in: compiz (Ubuntu) Sourcepackagename: desktop-effects => compiz -- gnome-screensaver occasions gets corrupted running dual-head with desktop-effects https://launchpad.net/bugs/96528 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
