More progress: The cause is meta_window_wayland_update_main_monitor() constantly changing which monitor the window (presumably DING because there aren't any others) prefers. The toggle is happening on the last line of meta_window_wayland_update_main_monitor() and if you remove that line then the bug goes away.
The next step will be to figure out why mutter is switching the DING window between monitors constantly. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1976204 Title: Screen freeze if a 4K monitor is added to a 4K laptop while DING is active To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1976204/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
