New answers tagged xrandr
Ok guys, here's the problem: Using the Thinkpad Ultra Dock, all connected displays are internally handled by a Displayport hub. Sadly, Linux can't differante multiple monitors using the Displayport MST hub. Read it up here: http://www.thinkwiki.org/wiki/ThinkPad_Ultra_Dock Linux does not yet offer explicit support for the DisplayPort MST hub built into ...
Installing fglrx(catalyst-total from the AUR) fixed the problem, probably the xf86 driver had some problems with the graphic card DisplayPort.
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