I can see two problems but can't yet prove they are they primary causes
of screen freezes:
1. Recurring kernel errors from 'pcieport', mostly related to
Thunderbolt. Do you have anything plugged into Thunderbolt/USB-C?
2. Your Nvidia card is using the 'nouveau' driver which is known to be
unstable. Please use the 'Additional Drivers' app to install a supported
Nvidia driver.
If a freeze happens again then please reboot and then run:
journalctl -b-1 > prevboot.txt
and attach the resulting text file here.
** Summary changed:
- Xorg freeze
+ Screen freeze
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2130904
Title:
Screen freeze
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