And if all else fails, please attach 'gdb' to the process: sudo gdb /usr/bin/gnome-shell PID
and retrieve a backtrace of all threads using: thread apply all bt ** Summary changed: - wayland session hard freezes on login from GDM (X11 session works fine) + [qxl] wayland session hard freezes on login from GDM (X11 session works fine) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1878275 Title: [qxl] wayland session hard freezes on login from GDM (X11 session works fine) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1878275/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs