[SOLVED] Screen blanks when watching video

[JoeS]

Using Debian Lenny.

My computer screen goes blank: turns black, when I am watching videos.
Why is this and how would I turn it off?

Thanks

[reed9]

The exact method will vary depending on your desktop environment (GNOME, KDE, etc.) and the power manager you're using, but in general terms, open up your power manager and set it so that the display never sleeps.
Ubuntu Power Management

If that doesn't work, you can try these options:
Turn off DPMS (Display Power Management Signalling)

xset -dpms

Turn off screensaver blanking

xset s off

[JoeS]

Thanks that worked.
I found Kpowersave installed (using KDE). Icon in the system tray.
In one of the schemes (presentation) I chose to "disable display power
management).