dnf list *plasma
Last metadata expiration check: 2:50:47 ago on Wed 20 Jul 2022 05:32:42 PM +08.
Installed Packages
kde-settings-plasma.noarch 35.0-2.el8 @epel
kf5-plasma.x86_64 5.88.0-1.el8 @epel
when I using command:qdbus-qt5 org.kde.ksmserver /KSMServer logout 0 0 0 then met a issue below:
Cannot find ‘.logout’ in object /KSMServer at org.kde.ksmserver
How to fix this issue ? Many thanks 
BR
shuye