This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1817070

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1817070

Title:
  Thunderbolt display not detected

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I am using a Dell XPS 13 (9370) connected to a Caldigit TS3 Plus
  thunderbolt dock. On this dock I have two monitors connected. One is
  connected to the display port of the dock, the second one is connected
  to an USB-C Thunderbolt port using an USB-C to mini DP adapter.

  The second monitor is only detected, when I _first_ plug in the
  adapter and _then_ plug in the the cable to the adapter. This also
  only works when the system has booted _and_ I am logged in. I already
  disabled thunderbolt security completely in UEFI. Once the monitor has
  been detected it is also working during boot, when I restart the
  system.

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