On Wed 04 Aug 2010 at 17:52:48 +0800, Guo Jiahua wrote: > I have a laptop, with a VGA interface. > I connected a extra display to my laptop, but it shows nothing, > the state of it is "NO SIGNAL". > I wander how to config to use the two displaies, one of my > laptop, one extra. If "fn" key + F key works for you, well and good. If not please post the output of the command 'xrandr' with the extra display connected. After a reboot is probably best.