Dell XPS13, Universal Dock D6000, Displayports are not working

[zweiund40]

Hi all.

I'm a little bit desperated. A few days ago I got my new dell laptop: A 
Dell XPS13 9370 with an Universal Dock D6000. The dock has two 
Displayports and one HDMI port. As required, I installed the displaylink 
driver before connecting the dock to the laptop. But I've got still 
trouble with the video ports. The HDMI port is working. Without 
problems. But the two Displayports are dead. No signal on the ports, no 
recognition of the operating system. Nothing. I've done some googling, 
but nothing helped. Is there anybody who has the same issue? Where you 
able to fix it? How?

Best wishes
Thomas