xdg-screensaver — command line tool for controlling the screensaver
xdg-screensaver   suspend  WindowID
xdg-screensaver   resume  WindowID
xdg-screensaver  { activate  |   lock  |   reset  |   status }
xdg-screensaver  { --help  |   --manual  |   --version }
xdg-screensaver provides commands to control the screensaver.
xdg-screensaver is for use inside a desktop session only. It is not recommended to use xdg-screensaver as root.
suspend WindowID
            Suspends the screensaver and monitor power management.
            WindowID must be the X Window ID
            of an existing window of the calling application. The window
            must remain in existance for the duration of the suspension.
          
WindowID can be represented as either a decimal number or as a hexadecimal number consisting of the prefix 0x followed by one or more hexadecimal digits.
The screensaver can be suspended in relation to multiple windows at the same time. In that case screensaver operation is only restored once the screensaver has been resumed in relation to each of the windows
resume WindowIDWindowID
            must be the same X Window ID that was passed to a previous call
            of xdg-screensaver suspend
          activatelockresetstatus--help--manual--version