[ubuntu netbook remix] Dell Mini: problem selecting external screen

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http://ubuntuforums.org – A friend has a Dell Mini 12 Notebook which came loaded with Ubuntu 9.04. He reports that he can't switch to use an external screen / projector: the key combination has no effect. I won't get to see the machine 'til Friday, but I thought I'd ask if there are any known problems Ubuntu on with this hardware ? Everything else seems fine. Obviously I'll check that he is using the correct key combination. Maybe this is more of a hardware issue...but there should be Comments welcomed. AM (Hardware)