Lubuntu 14.04 black screen after 10 minutes

[orestis-0]

Hello, I unchecked every option in the light locker(even deleted it) and power manager for making the screen black. It still continuous to do it even when I watch videos in full screen. From what I searched a lot of people have the same problem but did not find any useful answers. Can you please help me?
Thank you!

[Dennis N]

The 10 minute time you mention points to DPMS (Display Power Mangement Signaling) as the problem.

This solution worked for me (from link below) - install xscreensaver and set it to autostart in Lubuntu's startup applications. Also I disabled light locker and set power manager to never put the monitor to sleep.
https://bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/1193716/comments/15
It works because Xscreensaver overrides DPMS. From Arch Wiki:

XScreenSaver manages display energy saving (DPMS) independently of X itself and overrides it. To configure the timings for standby, display poweroff and such, use xscreensaver-demo or edit the configuration file manually, e.g. ~/.xscreensaver
source: https://wiki.archlinux.org/index.php/XScreenSaver
Settings dialog for xscreensaver: Preferences > Screensaver
Autostart command for xscreensaver: xscreensaver -no-splash

[orestis-0]

I tried it.... Didn't work...