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If your distribution doesn't come with a default installation of
xfce4-power-manager usually when you install it, it will be started next time you log into your Xfce desktop. In order to start it manually you just need to run the following command
xfce4-power-manager from your terminal emulator. Please note that running this
xfce4-power-manager command will cause the power manager to run in daemon mode. You can optionally add
–no-daemon as a command line argument to disable this behavior, This can be useful if you want to see debugging outputs from your terminal emulator.