Clone is the safest. With a non-clone mode you might not have DRI anymore depending on the hardware, besides it might need changes to xorg.conf to work properly (the Virtual setting..).
** Changed in: xorg (Ubuntu) Status: New => Won't Fix -- Jaunty External monitor in clone mode by default https://bugs.launchpad.net/bugs/323427 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs