[Bug 1906857] [NEW] XPS 9310 Developer Edition not booting when connected to WD19TB dock

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With a XPS 9310 Developer Edition laptop (using pre-installed Ubuntu
20.04 from Dell with all updates, including LVFS updates for laptop and
dock) is powered off and connected to the WD19TB docking station, it
will not boot when I power it on.

When I press the power button (on the laptop or dock) the screen on the
laptop becomes active, shows a dell logo, but just stays stuck that way
indefinitely.

If I press and hold the power button for 10+ seconds the computer can be
forcefully shut down. When I start it up again after forcing it down I
then see the Dell logo, but the computer continues where the next screen
I see is a GRUB boot menu. From there I can choose "Ubuntu" and the
computer boots normally with no problems.

Another way to make everything work is before booting the computer,
unplug the Thunderbolt cable from the laptop. Then it boots up normally
and I can connect the Thunderbolt cable again and things work normally
from there.

I am seeking a solution so I can leave the laptop connected to the
docking station and have it boot up normally on the first attempt (no
forced shutdowns or having disconnect/reconnect things).

Some details:
OS: Ubuntu 20.04 factory installed from Dell with all updates as of this date.
Kernel: 5.6.0-1034-oem
Laptop: XPS 9310 Developer Edition
Dock: WD19TB

** Affects: plymouth (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: dell dock
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XPS 9310 Developer Edition not booting when connected to WD19TB dock
https://bugs.launchpad.net/bugs/1906857
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