Bug 476334

SUMMARY
Hello everyone,
I have a laptop (ryzen Zen2, integrated graphics) with ARCH Linux KDE plasma (Wayland session). When I wake up it from suspend, it shows the black screen  "The screen locker is broken... loginctl unlock-session ..." 
It happens only if external monitor (HDMI) was connected before sleep. 


STEPS TO REPRODUCE
1. Connect external monitor to laptop
2. Suspend laptop
3. Disconnect external monitor from laptop 
4. Wake up

OBSERVED RESULT
Black screen with message "The screen locker is broken and unlocking is not possible... loginctl unlock-session ..." 

EXPECTED RESULT
Plasma lockscreen 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch linux
KDE Plasma Version: 5.27
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
journalctl -b

Oct 30 20:16:53 pc kernel: traps: kscreenlocker_g[2642] general protection fault ip:7f75cd44c1a8 sp:7ffe0a6bad18 error:0 in libQt5Qml.so.5.15.11[7f75cd2a7000+281000]
Oct 30 20:16:53 pc kwin_wayland_wrapper[1022]: not a valid new object id (2), message get_registry(n)
Oct 30 20:16:53 pc kwin_wayland_wrapper[1022]: error in client communication (pid 1022)
Oct 30 20:16:53 pc kwin_wayland_wrapper[2805]: error: received delete_id for unknown id (60)
Oct 30 20:16:53 pc kwin_wayland_wrapper[2805]: error: received delete_id for unknown id (31)
Oct 30 20:16:53 pc kwin_wayland_wrapper[2805]: error: received delete_id for unknown id (51)
Oct 30 20:16:53 pc kwin_wayland_wrapper[2805]: error: received delete_id for unknown id (41)
Oct 30 20:16:53 pc kwin_wayland_wrapper[2805]: error: received delete_id for unknown id (47)
Oct 30 20:16:53 pc kwin_wayland_wrapper[2805]: error: received delete_id for unknown id (92)
Oct 30 20:16:53 pc kwin_wayland_wrapper[2805]: error: received delete_id for unknown id (42)
Oct 30 20:16:53 pc kwin_wayland_wrapper[2805]: error: received delete_id for unknown id (23)
Oct 30 20:16:53 pc kwin_wayland_wrapper[2805]: error: received delete_id for unknown id (22)
Oct 30 20:16:53 pc kwin_wayland_wrapper[2805]: wl_display@1: error 1: invalid arguments for wl_display@1.get_registry
Oct 30 20:16:53 pc kscreenlocker_greet[2805]: The Wayland connection experienced a fatal error: Invalid argument
Oct 30 23:16:53 pc kscreenlocker_greet[2810]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
Oct 30 23:16:53 pc kscreenlocker_greet[2810]: The Wayland connection broke. Did the Wayland compositor die?
Oct 30 23:16:53 pc kscreenlocker_greet[2814]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
Oct 30 23:16:53 pc kscreenlocker_greet[2814]: The Wayland connection broke. Did the Wayland compositor die?