I'm cc'd on this thread from a while ago when I was looking around for
solutions to the many issues that plagued my XPS 9300 laptop and my
WD19TB dock (same combination as OP here). I can state that with any
Linux kernel 5.10.16 or later, and XPS BIOS 1.5.0, and dock firmware
01.00.15.01, all problems are fixed. I use that combo daily (although up
to kernel 5.12.2 now on Arch Linux) and never get any problem at all
which is surprising actually given how flaky it was beforehand. There
were a heap of i915 patches done in 5.10.15 which are required and then
1 more from 5.10.16 (Fix vswing programming for TBT) that is essential.
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https://bugs.launchpad.net/bugs/1889342

Title:
  Thunderbolt Dock Loses Monitors

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