Hi guys, I have indirect comment, but related to thuderbold support. I
have Dell xps 13 and by running on 4.12.12 kernel I get same messages on
Dell DA200 UCB-C adapter (provides HDMI and Ethernet and VGA and USB).
In didn't get it working yet, but just testing it with latest available
kernel on Gentoo system =4.15.7 (release 1).

I found in my case information that it might help if I upgrade the
thunderbolt firmware in the laptop, which dell made open source:
https://github.com/dell/thunderbolt-nvm-linux

Not sure if HP provides you with Thunderbolt firmware update for Linux
(although in case of Dell the files are extractable from Windows CAB
files, but I am studying it at the moment)

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https://bugs.launchpad.net/bugs/1696325

Title:
  USB, display and ethernet ports in HP Thunderbolt dock don't work

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