Thanks to plenty of clear and sufficient advices about getting rid off 'screen saver', I can say I am pretty experienced in that field (at least theoretically)... However I did not solve the problem yet!
The thing is, that this solution (which seems to be the best one) after few moments of waiting, gives me a black&white picture - a perfect one to make sb feel dizzy. It looks like some kind of repeatable, deformed-checker pattern.
Poking the mouse or pressing any key makes it disappear and recovers the normal screen.
Could you please give me any hints to check out what actually went wrong?
I am running the latest distribution of Raspbian on Raspberry Pi 2.0. In the background there are an Apache, FTP and MySQL servers running and also Chromium in the kiosk mode.