Xfce4 would not start a screensaver on my Linux system. Researching it, it ran xflock4 from the command line ad received an error: Property "/general/LockCommand" does not exist on channel "xfce4-session". To fix this, additional configuration needed, but no hacks. First, verify xflock4 and xfconf-query are available. $ which xflock4 xfconf-query /bin/xflock4 /bin/xfconf-query Next install a lock screen package that provides 'xlock', 'slock', 'i3lock' or similar. $ sudo yum install -y xlockmore-gtk i3lock Last, add an executable (with options) as /general/LockCommand in the xfce4-session settings. $ xfconf-query -c xfce4-session --create -p /general/LockCommand --set "xlock -mode matrix" --type string $ xfconf-query -c xfce4-session --create -p /general/LockCommand --set "i3lock -c 000000" --type string Test by running xflock4 from the command line or through the GUI.
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