I am seeing the same problem with using a USB-C monitor connected directly to my laptop. I do have one crash file in /var/crash -- see attached. The file might be a red-herring though caused only by me trying to restart gnome-shell once it was stuck.
** Attachment added: "_usr_bin_gnome-shell.1000.crash" https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1970043/+attachment/5585192/+files/_usr_bin_gnome-shell.1000.crash -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1970043 Title: [amdgpu] freeze occurs when wayland is connected to a second monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1970043/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs