Ok, got it... It was due to the triple-buffering patch that was ignoring the pending update, see https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1441#note_1428961
** Changed in: gnome-control-center (Ubuntu) Status: New => Won't Fix ** Changed in: mutter (Ubuntu) Status: New => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1966178 Title: Screen-privacy couldn't work To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1966178/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs