In my case, the screensaver is not set to lock the screen, just show the contents of ~/Pictures, but still does not engage after a while.
The time taken to (not) do this appears random, but once it's failed to engage, it never does do so until stopped and restarted. mate-screensaver 1.24.0-1 amd64 on focal The output of four examples attached: ^C was used to exit each time when it failed. ** Attachment added: "mate-screensaver --debug.txt" https://bugs.launchpad.net/ubuntu/+source/mate-screensaver/+bug/1783224/+attachment/5372015/+files/mate-screensaver%20--debug.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1783224 Title: Mate-Screensaver does not engage after some amount of uptime To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-mate/+bug/1783224/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs