Thanks for the bug report.
1. If you have any gnome-shell extensions (other than the default Ubuntu
ones) then please uninstall them and retest. We find a large number of
bugs are caused by Gnome extensions.
2. Your kernel log mentions a few errors from the nouveau kernel driver:
[ 274.310794] nouveau :01:00.0: bus: MMIO read of FAULT at 619444
[ IBUS ]
[ 274.959650] nouveau :01:00.0: bus: MMIO read of FAULT at 619444
[ IBUS ]
[ 294.627149] nouveau :01:00.0: bus: MMIO read of FAULT at 619444
[ IBUS ]
[ 305.108717] nouveau :01:00.0: bus: MMIO read of FAULT at 619444
[ IBUS ]
but we can't know for sure if those are related to what you see.
Please try installing the proprietary Nvidia driver instead, as it
usually provides better stability:
sudo apt install nvidia-driver-418
I am confident one of those two suggestions will solve the problem.
Please tell us which (if any) works.
** Summary changed:
- Xorg freeze
+ [nouveau] Xorg freeze
** Tags added: nouveau
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1829430
Title:
[nouveau] Xorg freeze
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