This has definitely been resolved with linux-image-4.15.0-45-generic.
Reboots, hot dock / undock, changing the displays in system prefs, etc
no longer lock the laptop up.
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package linux-image-4.15.0-45-generic appears to have resolved this
issue. I will follow up after further testing.
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https://bugs.launchpad.net/bugs/1814145
Title:
laptop completely lock
Public bug reported:
Description:Ubuntu 18.04.1 LTS
Release:18.04
Package:linux-image-4.15.0-44-generic
Hardware: Dell Precision 5530 with Dell Thunderbolt Dock
Latest round of updates added kernel 4.15.0-44. On reboot the kernel
hangs the laptop, have to do a full hard