And now, I managed to get a repro of the stated problem: USB controller
fails to complete initialization when connecting the thunderbolt cable.

This was 100% reproduceable for a few runs (logs 1 through 5), and only
stopped reproducing when I removed an Android device that was sitting at
the end of the USB chain - this is log 6 that successfully completed
setup.

** Attachment added: "lp1856161-dyndbg-logs-connect-fail.tar.gz"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1856161/+attachment/5316692/+files/lp1856161-dyndbg-logs-connect-fail.tar.gz

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

Title:
  Thunderbolt dock fails to connect USB devices

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