My screen are darkening every 20 or some minutes. It was originally xscreensaver installed, but nothing changed after I removed it. This behavior very annoying when I am trying to see some movie.
There is output of
Screen Saver: prefer blanking: yes allow exposures: yes timeout: 0 cycle: 0 DPMS (Energy Star): Standby: 7200 Suspend: 7200 Off: 14400 DPMS is Disabled
I have tried to disable DMPS by
xset -dpms but it looks like something reenables it time-to-time.