Clone mode (what Fn-F7 *should* do) works by displaying the contents of a display through two outputs of the *same* resolution.
The Xinerama multihead support allows a large desktop area cross two displays, which may, or may not, be the same resolution. -- laptop thinkpad X60s switch screen doesn't work https://launchpad.net/bugs/52777 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
