Screen shuts off after 10 minutes-- NOT screensaver, not Power Options-- ubuntu 10.04
 

Watching a video, listening and working, every time I come back to it I see the screen has gone black, I have to jiggle the mouse. I estimate the shutoff to come after ~10 minutes. I have set the screen saver to wait 90 minutes, and the Power Options to NEVER shut off the screen. It still happens.

If you are running gnome and compiz check the screensaver settings in both. One overrides the other.

Sometimes the Linux kernel will shut off the screen. I used to have this problem in other distros but not in Ubuntu 10.04. Here is some information about disabling the Linux kernel power save for the screen.

http://www.cyberciti.biz/tips/linux-...ing-blank.html

Note the line to add to ./.xinitrc. Ubuntu 10.04 doesn't have this file by default so you may have to create it or use the system xinitrc or something similar. Since I don't have this problem with my current configuration so I cannot find the specific answer for Ubuntu 10.04.

Note that this setting is independent of X or Gnome. It is a Linux kernel feature.

Have you tried using a recent xscreensaver instance rather than the stock screensaver?

Also, try doing

and seeing if anything interesting pops up. I had this on an older version (I think Fedora Core 3 or somesuch) where in KDE I explicitly turned off the screensaver, but it was STILL running - I had this same problem you describe here - suddenly finding the screen switching off when watching a video. Turned out I had to manually kill the screensaver process. But I still wanted a proper screensaver that heeded my time selections, so I got xscreensaver. I compiled and installed that and everything was fine.

Screen shuts off after 10 minutes-- NOT screensaver, not Power Options-- LinuxMint18. I also had this problem: Fixed it by setting a screen saver, waiting for 10 minutes, signing back in then going back to power options and resetting to Never. Works great now. I leave my machine on 24/7 and never have to sign in.