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 *** STEPS TO REPRODUCE 1. Use plasma 2. Hit Meta+L 3. Screen goes blank only showing the mouse, unable to log into GUI again OBSERVED RESULT Sometimes when manually locking the screen, instead of showing the lock screen, the entire GUI crashes. These are the relevant logs from when the crash happened and I could precise the time to grep them: Feb 03 19:31:47 arch plasmashell[4618]: file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:306: TypeError: Cannot read property 'width' of null Feb 03 19:31:47 arch plasmashell[4618]: file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/global/Globals.qml:136: TypeError: Cannot read property 'screenGeometry' of null Feb 03 19:31:47 arch plasmashell[4618]: file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/global/Globals.qml:250: TypeError: Cannot read property 'plasmoid' of undefined Feb 03 19:31:48 arch systemd[4431]: plasma-plasmashell.service: Consumed 8.583s CPU time. Feb 03 19:31:48 arch systemd[4431]: Started dbus-:1.4-org.kde.KSplash@1.service. Feb 03 19:32:33 arch systemd[4431]: Starting KRunner... Feb 03 19:32:33 arch systemd[4431]: Started KRunner. Feb 03 19:32:33 arch krunner[7373]: QObject::startTimer: Timers cannot be started from another thread Feb 03 19:32:34 arch krunner[7373]: qt.qpa.wayland.textinput: virtual void QtWaylandClient::QWaylandTextInputv3::zwp_text_input_v3_leave(wl_surface*) Got leave event for surface 0x0 focused surface 0x58d42c0885e0 Feb 03 19:32:36 arch kwin_wayland[4496]: kwin_core: Cannot grant a token to KWin::ClientConnection(0x5cdc1b552f20) Feb 03 19:32:41 arch kwin_wayland[4496]: QProcess::start: Process is already running Feb 03 19:32:47 arch systemd[1]: Created slice Slice /system/getty. Feb 03 19:32:47 arch systemd[1]: Started Getty on tty2. EXPECTED RESULT Lockscreen should work as usual SOFTWARE/OS VERSIONS Linux/KDE Plasma: 6.7.3-zen-1-1-zen (available in About System) KDE Plasma Version: 5.93.0 KDE Frameworks Version: 5.249.0 Qt Version: 6.7.0 ADDITIONAL INFORMATION Some time before the crash there is also some PAM errors: Feb 03 19:31:12 arch kscreenlocker_greet[6899]: PAM unable to dlopen(/usr/lib/security/pam_pkcs11.so): /usr/lib/security/pam_pkcs11.so: cannot open shared object file: No such file or directory Feb 03 19:31:12 arch kscreenlocker_greet[6899]: PAM adding faulty module: /usr/lib/security/pam_pkcs11.so Feb 03 19:31:12 arch kscreenlocker_greet[6899]: PAM unable to dlopen(/usr/lib/security/pam_fprintd.so): /usr/lib/security/pam_fprintd.so: cannot open shared object file: No such file or directory Feb 03 19:31:12 arch kscreenlocker_greet[6899]: PAM adding faulty module: /usr/lib/security/pam_fprintd.so
PAM errors are also happening when the lockscreen succeedes, so I do'nt think they're related
Switched back to 5.27 and this doesn't seem to happen.
If you switch to another tty and run "loginctl unlock-session 2" (the session id might be different on your machine), is the black screen gone?
Those PAM errors indicate a setup issue on your machine. The screen locker needs those modules to be present and functional, but it looks like on your machine they are not.