Automatic screen blanking

How does one set it up so your screens automatically blank out after a given period of inactivity?

On other distros, I simply use

xset -dpms && xset s 300

...and it works fine. After 5 minutes, the screen goes blank. Doesn't happen in Elive E16.

The screen DOES go blank if I lock it with

elive-pm lock

...but what if I don't want the screen to be locked?