Disable Blank Screen on Idle

[Ken D'Ambrosio]

> Ubuntu 18.04.1 LTS and xdg/openbox as X environment. 
> 
> About the mail title, I would like disable blank screen on idle (it is happening to 10min). I've tried (found in another thread as solution): 
> 
> xset s off 
> xset -dpms <--- this isn't working, it shows "server doesn't have extension for -dpms option" 
> xset s noblank

Two things: 

* I'd suggest checking, through the GUI, your power and screensaver
options. 

* If you're plugged into an external screen, I'd also check *its* power
options.  (Especially if, like me, it's a TV-as-monitor.) 

-Ken
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