There's more to it - commands with --quit and --restart options won't do anything
~$ ps -ef | grep power-manager | grep -v grep u******+ 25698 23969 0 00:45 ? 00:00:00 xfce4-power-manager ~$ xfce4-power-manager --quit ~$ ps -ef | grep power-manager | grep -v grep u******+ 25698 23969 0 00:45 ? 00:00:00 xfce4-power-manager u******+ 25705 23969 0 00:45 ? 00:00:00 xfce4-power-manager --quit ~$ xfce4-power-manager --restart ~$ ps -ef | grep power-manager | grep -v grep u******+ 25698 23969 0 00:45 ? 00:00:00 xfce4-power-manager u******+ 25705 23969 0 00:45 ? 00:00:00 xfce4-power-manager --quit u******+ 25711 23969 0 00:45 ? 00:00:00 xfce4-power-manager --restart
because it seems like initial instance of xfce4-power-manager "does not exist" for session manager? Maybe this explains these "did not receive a reply" messages?
There's more to it - commands with --quit and --restart options won't do anything
~$ ps -ef | grep power-manager | grep -v grep
u******+ 25698 23969 0 00:45 ? 00:00:00 xfce4-power-manager
~$ xfce4-power-manager --quit
~$ ps -ef | grep power-manager | grep -v grep
u******+ 25698 23969 0 00:45 ? 00:00:00 xfce4-power-manager
u******+ 25705 23969 0 00:45 ? 00:00:00 xfce4-power-manager --quit
~$ xfce4-power-manager --restart
~$ ps -ef | grep power-manager | grep -v grep
u******+ 25698 23969 0 00:45 ? 00:00:00 xfce4-power-manager
u******+ 25705 23969 0 00:45 ? 00:00:00 xfce4-power-manager --quit
u******+ 25711 23969 0 00:45 ? 00:00:00 xfce4-power-manager --restart
because it seems like initial instance of xfce4-power-manager "does not exist" for session manager? Maybe this explains these "did not receive a reply" messages?