Using Fn key to display output to monitor only


I’m new to Linux and I’ve just installed openSUSE 11.1. I’m using a Dell Inspiron laptop. My laptop screen does not work so I connect to an external monitor to do my work. So I like to send the output just to my monitor rather than my laptop screen.

The combination of keys (Fn+CRT/LCD) works fine on Windows and I have used it on an older version of openSUSE as well. However, with the new version I can’t set the output to be just from my monitor by clicking the Fn keys.

Can anyone please tell me how I can fix this?