Yes, I can confirm that with the 4.15.0-9 kernel with which the
touchscreen works, if I disconnect the keyboard dock I need to power
cycle (not just reboot) the machine to get it back.

Dmesg for disconnecting and reconnecting the dock for the 4.15.0-9 and
the old 4.12.0-13 (with which the touchscreen also worked, and does not
lose the keyboard dock) attached.

** Attachment added: "dmesg_4.15.0-9-generic.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1745342/+attachment/5058172/+files/dmesg_4.15.0-9-generic.log

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https://bugs.launchpad.net/bugs/1745342

Title:
  touchscreen that worked in artful with 4.12 no longer works with 4.13

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