Comment 53 for bug 1193716

As for the Presentation made, when it is used, and user locks screen, xflock4 may change DPMS on, so after unlocking, the mode may not work, unless re-enabled. It would be nice, if xfce4-power-manager could re-enable Presentation Mode (like "xset -dpms ; xset s off" in shell) automatically after screen locking stops, but this may be impossible at least with current xflock4, because normally screen is still locked after xflock4 exits.