Disable Blank Screen on Idle

[Oliver]

Hi,

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

Nothing working for now. Can someone help me please?

Thanks beforehand.

Cheers...
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