Choose vga output on port replicator

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http://askubuntu.com – I have an Acer laptop with a port replicator, the Easyport IV. System specs: Acer laptop, Travelmate 8172 Intel HD graphics Ubuntu 12.10 My problem: I have two VGA ports. One directly on my laptop and one on my easyport of course. Most of the times I am forced to use the VGA socket on my laptop, which somehow defeats the purpose of a having port replicator. xrandr -q doesn't list it as a different device of course. Also I don't get a udev signal. Sometimes, on rare occasions it will mystically pick the VGA on my Easyport, but I can't trigger that. How can I choose the VGA output on (HowTos)