Same for me as well, but running Dell XPS 13 with a Dell WD15 docking station.
The scenarios for me have been:
1, When changing the screen resolution on my laptop, both screens turns
blank and I have to reboot the computer
2, If power saving for the screens kicks in. I have to reboot the
Experienced the same problem as the OP. Downgrading to 4.15.0-43 worked
for as well. The only difference is that my laptop is Dell E7450.
To be more specific, With dock and an external screen the system freezes
when I close the laptop lid. When booting with the laptop lid is closed,
the system
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1813765
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