[ubuntu netbook remix] I can't set screen resolution above 800x600

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http://ubuntuforums.org – I have an eee 901 (with its tiny screen) and just bought a separate LCD screen. I tried to set the screen resolution with gnome-display-properties, but the maximum in the drop-down menu is 800x600 pixel. How can I change this? I checked the xorg.conf, but it is more or less empty. This is on 9.04 Per. PS. My other 9.04 machines ("normal" size laptops) have a lot more alternatives for screen resolution. (Hardware)