I can put my monitor into sleep executing
xset dpms force off

I've reinstalled gnome-screensaver, but it didn't help. So, I've disabled 
gnome-screensaver and instaled xscreensaver. Now it works.
But it is a work around, but not the solution.

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Power manager puts monitor into sleep only once
https://bugs.launchpad.net/bugs/158927
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