Public bug reported:
This bug is very similar to https://bugs.launchpad.net/dell-
sputnik/+bug/1752165 and has the same steps to reproduce, but it's not
related to nvidia drivers. I have Lenovo Thinkpad T480s connected to a
ThinkPad Thunderbolt 3 Dock. I have installed 4.15.0.46, 4.18.0.16
kernel. Both of these kernels have the issue. I followed this comment
https://bugs.launchpad.net/dell-sputnik/+bug/1752165/comments/41 and
installed 4.20.6 from UKUU and the issue is gone.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "dmesg"
https://bugs.launchpad.net/bugs/1820811/+attachment/5247504/+files/dmesg_dock_conneted_back.txt
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https://bugs.launchpad.net/bugs/1820811
Title:
Thunderbolt3 dock freezes X on hotplug when used with external
displays
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