What does xfce4 power-manager do in "presentation mode"?

Question

What exactly does the xfce4-power-manager if I press the button for presentation mode?

Is it called X function? Or what else?

Any ideas?

Solution 1

It does two things, both intended to keep automatic features from messing up a presentation where you don't touch the machine for a long time (e.g. a teacher showing a video to a class):

• Turns off DPMS (Display Power Management Signaling) so your screen won't blank or sleep
• Prevents screensaver mode from activating

Solution 2

It prevents your system from suspending or hibernating.