apt-get install x11-xserver-utils

edit /etc/xdg/lxsession/LXDE/autostart and add these three lines.
@xset s off
@xset -dpms
@xset s noblank

and
~.xinitrc
xset s off # don’t activate screensaver
xset -dpms # disable DPMS (Energy Star) features.
xset s noblank # don’t blank the video device

or:
sudo vi /etc/kbd/config
BLANK_TIME=0

or:
sudo vi /etc/rc.local
setterm -blank 0

from console:
sudo sh -c „TERM=linux setterm -blank 0 >/dev/tty0

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