Solution 1:
Edit /etc/X11/xorg.conf file using the following command
sudo vi /etc/X11/xorg.conf
and add the following lines
Section “ServerFlags”
#other options can go here
Option “BlankTime” “0″
Option “StandbyTime” “0″
Option “SuspendTime” “0″
Option “OffTime” “0″
EndSection
Save and exit the file
Solution 2
Edit /etc/X11/xorg.conf file using the following command
sudo vi /etc/X11/xorg.conf
This effectively disables power management on your monitor Settings
Section “Monitor”
#other options can go here
Option “DPMS” “false”
EndSection
Save and exit the file and restart your machine
Solution 3
gconftool-2 –set “/apps/gnome-screensaver/idle_activation_enabled” –type boolean false
Solution 4
gnome-screensaver-command –inhibit
Solution 5
gnome-screensaver-comand –poke
One of all the above should work in your UBUNTU (I hope…)