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When I'm watching a film in Mythtv the screen turns to black every 10 - 15 mins and I have to log back into Ubuntu. Very annoying!

How do I disable the black screen / screensaver / logout in Unity?

There no longer seems to be any options to turn the screen saver off as there were in Ubuntu prior to Unity.

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Follow this instruction: How to Disable Screensaver/Lock Screen/Sleep Mode in Ubuntu? –  user141261 Mar 18 '13 at 3:51

3 Answers 3

up vote 46 down vote accepted
  • Go to System Settings...Brightness and Lock:

    enter image description here

  • The default screensaver idle time is 10 minutes, and the screen is locked once the screensaver activates:

    enter image description here

  • You can adjust the idle time (or disable the screensaver), and also disable the lock:

    enter image description here

  • Simply close Brightness and Lock to apply the new settings.

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5  
This does not work. The X server has a separate setting that still causes the monitor to turn off after N minutes of inactivity. –  Cerin May 2 '13 at 10:47
1  
And how do you disable that setting? –  matteo Oct 24 '13 at 18:18
1  
And why on earth is this non-working answer marked as answer? –  matteo Oct 24 '13 at 18:18
    
Well, it sort of works. You don't have to authenticate, but you still have to move the mouse or press a key to wake the screen back up. So I agree it's not a very good answer. –  Bob Doolittle Sep 16 at 17:56

If the unity gui doesn't work, then you could try using xset

Open a terminal and type:

xset s off

Also try some things here:

https://wiki.archlinux.org/index.php/Display_Power_Management_Signaling#xset_screen-saver_control

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If GUI is not an option, the best command-line solution as of Ubuntu 14.04 is:

To disable the screen blackout:

gsettings set org.gnome.desktop.session idle-delay <seconds> (0 to disable)

To disable the screen lock:

gsettings set org.gnome.desktop.screensaver lock-enabled false

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protected by Community Mar 18 '13 at 4:06

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