If you are using the 'intel' driver then this would be a duplicate of bug 1867668, but the attached logs show you're not using that driver (which is good in theory).
To verify which it is, please wait until the problem happens again and then run: journalctl -b0 > journal.txt and attach the file 'journal.txt' here. ** Changed in: xorg (Ubuntu) Status: New => Incomplete ** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1876531 Title: Dynamic desktop background when TearFree is true To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1876531/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs