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My MacBook's brightness decreases even though I've unset “Automatically adjust brightness as ambient light changes” & “Automatically reduce brightness before display goes to sleep”. It does so within about 2 minutes, in a variety of apps, both when plugged in and unplugged. How can I diagnose and/or fix this?

  • Does this coincide with unplugging your Macbook from power? Also what year/model of Macbook is it? – owlswipe Jun 9 '16 at 21:37
  • No, it happens both when plugged in and unplugged, in both cases even for a long period of time, and when my battery is full. It's a 13 inch mid-2012 MacBook Pro - I actually bought it in 2014, it's the old non-Retina model they kept around until then. It's a refurb model so I still get free repairs from Apple. – tog22 Jun 9 '16 at 22:22
  • Try downloading the caffeine app for Mac (search for it in the Mac App Store), and turn it on so that it'll keep your Mac awake. Then tell me if the problem persists. – owlswipe Jun 9 '16 at 22:28
  • @JohnRamos Easier to just use caffeinate from the command line, since it's part of OS X. – JMY1000 Jun 10 '16 at 6:47
  • @JMY1000 Sure, but that could sound daunting :). – owlswipe Jun 10 '16 at 12:08

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