With the `dyndbg` flag, I can't seem to reproduce the problem: I tried
to connect and disconnect the cable a few times as well as rebooting
(which was almost 100% guaranteed to cause this issue).

I attached logs of the successful thunderbolt connection while running
and a boot log with the dock already connected. There are things there
that seemed to me like error messages that might be interesting
regardless?

I'll continue using the `dyndbg` flag and will report later this week if
the problem has been reproduced (I connect the dock a could of times a
day, usually when the computer is already on, but sometimes when it is
suspended or off), or whether enabling the debug flag is a workaround
:-p

** Attachment added: "lp1856161-dyndbg-logs.tar.gz"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1856161/+attachment/5316687/+files/lp1856161-dyndbg-logs.tar.gz

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https://bugs.launchpad.net/bugs/1856161

Title:
  Thunderbolt dock fails to connect USB devices

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