Inhibiting display stand-by

English Applications
1

Using xfce. After about 10 minutes of non-activity, my display goes into stand-by mode. How can I inhibit this when watching a film (vlc, Firefox)?

2

Activate the presentation mode. Does this help?

3

What is presentation mode and how do I activate it?
Display power management and Xscreensaver are disabled in Applications/Settings.

4

Click on the power/pattery icon in the task bar.

5 
bor@10:~> xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/presentation-mode
true
bor@10:~> xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/presentation-mode -T
bor@10:~> xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/presentation-mode
false
bor@10:~> xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/presentation-mode -T
bor@10:~> xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/presentation-mode
true
bor@10:~>
6

Maybe you will find what you need in here:
(xfce:xfce4-power-manager:preferences [Xfce Docs])