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I have set 'Turn screen off' to Never in Brightness and Lock, but my screen still goes dark after some time being idle, unless I'm watching a movie in VLC or some other media player.

What can I do to make it so my screen never goes dark regardless of whether the computer is idle or not?

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System Settings -> Brightness and Lock. – Ben Lin Jun 3 '13 at 22:53
possible duplicate of Disable blank screen in 12.04 – Cees Timmerman Oct 27 '14 at 10:38

There's a setting called "Disable Screensaver". Do you ave this option checked? You can find it in Tools>Preferences>Video (Select "All" under Show Settings instead of "Simple") and click on "Video" in the left column. About the middle of the box you should see "Disable Screensaver".

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