Turning the video output on and off

["Epelman Boris" <Boris_Epelman@elgems.com>]

Hi!

Some video switches can sense the video output to decide when to switch
between different displays.

1) Is it possible to turn video output of display on and off in X. 
2) Is it possible to turn video output of specific screen of the display on and off in X.

I believe that some screen savers do so.

Thanks, 
Boris Epelman


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