vim /etc/xdg/lxsession/LXDE/autostart @xset s off @xset -dpms @xset s noblank
http://raspberrypi.stackexchange.com/questions/752/how-do-i-prevent-the-screen-from-going-blank
aptitude remove gnome-screensaver
http://blog.tordeu.com/?p=292 - działa
Kubuntu
Start > Energy Saving > uncheck Screen Energy Saving