Fedora 30 and Dell D6000 dock

[pjw]

Hi,
Just recently got a new Lenovo Yoga C930, along with a Dell D6000 dock. The dock works perfectly under Windows, with no manual driver installation required: all video outputs work fine.
Under Fedora 30, I can't get any video out (either HDMI or DP): there is not even a flicker of acknowledgement that a monitor is connected. I've trawled through all sorts of suggested options, and haven't managed to make any progress.
I've run the DisplayLink support tool and attached the result - please let me know if anyone has suggestions to get this thing working.

P.