Thanks Daniel. You were right about the extensions, thank you for the suggestion.
It appears to be caused by the "Nothing to Say" gnome extension. I uninstalled this, and can now use the wayland session again. It looks like it's probably the same issue as reported here (by a user running 20.04): https://github.com/wbolster/nothing-to-say/issues/49 Thanks for your time, sorry if I wasted it by suggesting the bug was was mutter-related. ** Bug watch added: github.com/wbolster/nothing-to-say/issues #49 https://github.com/wbolster/nothing-to-say/issues/49 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1966921 Title: Display freezes after entering password from login screen Status in mutter package in Ubuntu: Incomplete Bug description: The display freezes with the same background colour as the login screen. The mouse pointer no longer moves. I was unable to change to another VT when the display freezes. Only a press of the power button seemed to make the laptop respond by triggering a shutdown. I've had to switch to "GNOME on Xorg" to be able to login/see the desktop. Wayland was working fine until some time around the last week. ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: mutter 42~beta-1ubuntu2 ProcVersionSignature: Ubuntu 5.15.0-23.23-generic 5.15.27 Uname: Linux 5.15.0-23-generic x86_64 ApportVersion: 2.20.11-0ubuntu79 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: GNOME Date: Tue Mar 29 18:34:41 2022 InstallationDate: Installed on 2021-09-13 (196 days ago) InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819) SourcePackage: mutter UpgradeStatus: Upgraded to jammy on 2022-02-19 (38 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1966921/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp