Disable DPMS and prevent screen from blanking
Useful when watching movies or slideshows:
emacs ~/.bashrc & alias scron='xset -dpms; xset s off'
To see your current settings
xset q ... Screen Saver: prefer blanking: yes allow exposures: yes timeout: 600 cycle: 600 DPMS (Energy Star): Standby: 600 Suspend: 600 Off: 600 DPMS is Enabled Monitor is On