Originally Posted by len
Unfortunately (I guess), I am using RadeonHD in my systems. In the basic install I haven't moved to the fglrx drivers yet. It would seem that will be where I need to go with the install.
You cannot use the proprietary ATI drivers for the moment, it is not yet compatible with the F11 kernel.
I would try a bit more with the opensource driver first.
Drop to a commandline and run xrandr to check if the displays are properly detected, and your virtual display is large enough to support extended desktop.
If so, the issue is possibly the KDE display utility. You can also try to configure the displays with xrandr instead.
Also the opensource radeon driver is still in flux, new versions come out every couple of days, so perhaps you had a slightly different version with Gnome.