I have a Dell XPS-15 9570 and I am also affected by this bug.

I am currently running 18.10.

The external monitor does not work with HDMI at all - when I plug it in
to the machine, the monitor switches to low power mode.

The same monitor is working fine over HDMI with a Dell M3800 running
16.04

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https://bugs.launchpad.net/bugs/1771185

Title:
  Secondary monitor not connecting in 18.04 LTS

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