Comment 11 for bug 1852001

attached "ps auxw" while GUI was freezed.
kernel 5.4.1-050401-generic
no swap
I restarted GUI using /etc/init.d/sddm restart
right now only the KDE taskbar and menu are locked, Alt-Tab and programs still work. (this is a rather new phenomena)
I already experienced this once, where some programs were freezed too (eg libreoffice) and others weren't. I only got a message like "program does not answer, force close it"?
maybe this is a second hand problem as some inter-process communication locks apps when KDE is locked?

after about 5 minutes KDE bar crashed and restarted. now works.

from syslog while KDE bar locked:
pulseaudio[30539]: E: [pulseaudio] bluez5-util.c: GetManagedObjects() failed: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
...
PackageKit: daemon quit
systemd[1]: packagekit.service: Main process exited, code=killed, status=15/TERM
systemd[1]: packagekit.service: Succeeded.
...
dbus-daemon[1772]: [system] Activating via systemd: service name='org.freedesktop.PackageKit' unit='packagekit.service' requested by ':1.679' (uid=1000 pid=32050 comm="/usr/bin/plasmashell ")
systemd[1]: Starting PackageKit Daemon...
PackageKit: daemon start
dbus-daemon[1772]: [system] Successfully activated service 'org.freedesktop.PackageKit'
systemd[1]: Started PackageKit Daemon.