SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** When you log in with multiple users and then try to log out with one of them, screen stays black with cursor blinking, you can switch tty no problem to another user, but it's no convenient. If you log out with all users sddm log in screen appears, like it should. STEPS TO REPRODUCE 1. Log in with multiple users 2. Log out with one of them OBSERVED RESULT Black screen with cursor, keyboard is not responsive EXPECTED RESULT New sddm session. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Arch linux (available in About System) KDE Plasma Version: 5.27.2 KDE Frameworks Version: 5.103.0 Qt Version: 5.15.8
Unfortunately it's a bug with SDDM, so it would need to be solved upstream. https://github.com/sddm/sddm/issues/1660