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 shutdown then start. Laptop
will start and run fine when not docked. When docked to Dell Thunderbolt
dock with 2 external monitors connected by mini display port and HDMI
the laptop will lock up hard with any change to primary display. If I
boot with laptop open and display running, laptop works fine unless I
try closing lid to use just the external displays, this will completely
lock up the system. If I open system settings and re-arrange the
displays or change the primary display, the system will lock up hard.
Nothing is found in logs. Booting with the laptop closed not using the
laptop display, system will completely lock after logging into user
account.
The previous kernel, kernel 4.15.0-43 does not have this issue,
everything works fine, can re-arrange displays, hot dock and undock,
close lid to use only external displays, soft reboot and system does not
hang up or lock.
** Affects: linux-signed (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1814145
Title:
laptop completely locks up on video/display changes
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