After a week of testing v4.14-rc2, the conclusions remain the same:
- System doesn't freeze when booting up and logging in with the dock attached.
- Ethernet doesn't connect automatically on boot / after login, manual 
intervention required.
- System doesn't wake from suspend if the dock was disconnected during sleep.
- System does wake properly from suspend if the dock was connected during sleep 
or dock connection did not change at all.
- No sudden ethernet disconnects.

I've got also a TB16 dock now:
Problems with kernel 4.13.4: 
- Graphics crash when booting with dock attached, Ubuntu displayed a message 
asking what to do, but it recovered after selecting low res mode. 
Interestingly, I managed to log into desktop.
- Everything else same as with WD15 dock.

Kernel v4.14.rc2: same behavior as with v4.14.rc2 + WD15 dock.

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https://bugs.launchpad.net/bugs/1701499

Title:
  System often freezes or panics if I log in with Dell Dock WD15
  connected

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