I don't know if this information helps, but I have to tell ;)
When I connect my beamer to my laptop with a long (5m) vga-cable, the desktop 
and beamer resolution is set to 800x600 and I don't get the resolution higher.
When I use a short cable (1.5m) everything works fine (1024x768).
So for now, I have to start with the short cable, and then after booting plug 
the long cable :D

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Xorg resolution falling back to 640x480 and/or 800x600 when h/v freqs incorrect
https://bugs.launchpad.net/bugs/3731
You received this bug notification because you are a member of Kubuntu
Team, which is a subscriber of a duplicate bug.

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