When I quickly move the mouse cursor up to the top of the screen, its brightness increases. How can I prevent this? I use Ubuntu 14.04. Maybe it depends on laptop? Mine one is Lenovo E450. If yes, what do I do in that case?

  • 1
    LOL, never heard or noticed that before. Does it also decrease when you move the mouse downwards?
    – PerlDuck
    Jun 29, 2018 at 14:23
  • 2
    Is that a bug or a feature?
    – dessert
    Jun 29, 2018 at 14:27
  • Sorry, no offence. But that behaviour really sounds hilarious. Do you mean "moving the mouse"? or something else, like a touchpad or cursor keys? Perhaps you have installed some gesture software. I don't know if such exists, but that would be a possible explanation.
    – PerlDuck
    Jun 29, 2018 at 14:32
  • Did you activate something like "adaptive screen brightness"? Does the brightness also change when you move the cursor slowly?
    – danzel
    Jun 29, 2018 at 16:37
  • @danzel Even If I did this, it was accidentaly because I don't know how to do this:) No, it doesn't change if I move slowly Jun 29, 2018 at 17:10


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