Any extension in $HOME/.local/share/gnome-shell/extensions/ is not officially supported by Ubuntu, and so usually needs to be removed to prove it's not causing bugs.
But adding MUTTER_DEBUG_FORCE_KMS_MODE=simple to /etc/environment changes the kernel API used for screen updates and that alone might fix your problem like in other bugs: https://bugs.launchpad.net/ubuntu/+bugs?field.tag=atomic-commit -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/2088997 Title: Second screen completely frozen, some windows stuck To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2088997/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
