Sorry, the joy was (relatively) short-lived: Even with
`/etc/default/grub` `GRUB_CMDLINE_LINUX_DEFAULT` setting set to empty, I
can still reproduce this problem with the lp1766076 kernel: it
definitely happens less - maybe 1 in 3 times instead of almost always -
but it still happens.

Here's a boot dmesg log of a failing boot with no (additional) kernel
command line flags - xhci_hcd assumes the controller died on timestamp
27, after which none of the USB things on the dock work.

** Attachment added: "lp1766076-boot-dmesg.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1856161/+attachment/5314569/+files/lp1766076-boot-dmesg.log

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

Title:
  Thunderbolt dock fails to connect USB devices

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