Power management: How to not idle the monitor while viewing a movie?

[Ralf Mardorf]

On Mon, 2013-11-04 at 16:37 +0400, Sergey Mironov wrote:
> Hi List! I have an idle problem. Xfce seems to turn off my display
> when it thinks I am out of the computer. It works OK most of the time,
> but not when I am viewing a movie using mplayer/vlc etc. Is it
> possible to temporary disable the power management for this cases?
> More, is it possible to do it with a script?

To /etc/X11/xorg.conf add

Section "ServerFlags"
    Option "BlankTime" "0"
    Option "StandbyTime" "0"
    Option "SuspendTime" "0"
    Option "OffTime" "0"
EndSection

Then you can turn it on and off by Xfce.