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black screen on dell dockingstation

I'm running a dell e5540 with F20 and an external screen Samsung U28D590D.

Screenresolution 3840x2160 works when using the internal hdmi-connector, xrandr says:

HDMI2 connected primary 3840x2160+1920+0 (normal left inverted right x axis y axis) 608mm x 345mm

  • 3840x2160 30.00*+ 25.00 24.00 29.97 23.98
  • 2560x1440 59.95

when using the DVI-connector on the dockingstation, xrandr says: Screenresolution 3840x2160 makes black screen, desktop extends, primary screen is laptop

DP1-1 connected 3840x2160+1920+0 (normal left inverted right x axis y axis) 608mm x 345mm

  • 3840x2160 30.00* + 25.00 24.00 29.97 23.98
  • 2560x1440 59.95

when using the display-port: Screenresolution 3840x2160 makes black screen, desktop extends, primary screen is laptop

DP1-2 connected 3840x2160+1920+0 (normal left inverted right x axis y axis) 607mm x 345mm

  • 3840x2160 60.00*+
  • 2560x1440 59.95