When I'm using battery only - Ubuntu turns in some mode, when If I do not use my PC for about 5-10 seconds - the screeen becomes darker.

Where do turn this option off? Because I often need to read (without pressing keys and moving my mouse) and I can't see with dark screen.



Open System settings. Then, click the Screen option, and uncheck the Dim screen to save power box:

enter image description here

And you're done!


Open gnome-power-preferences - to do that, hit Alt+F2, then type in gnome-power-preferences. You'll see something like this:

gnome-power-preferences on the AC Power Tab

Go to the "On Battery Power" tab, then you'll want to make sure that the "Reduce Background Brightness" box isn't checked:

gnome-power-preferences on the Battery Power Tab

That should do the trick.

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