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My MacBook Pro doesn't adjust the brightness when I hit the brightness controls on my keyboard (F5/F6). I've tried turning off automatic brightness to no avail. How do I use the function printed on the function keys?

brightness control screenshot

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According to OS X Daily, it's because your light sensor is detecting that you are in too bright of an environment to use the backlit keyboard. Try moving to a darker area, or covering your light sensor to see if it then lets you turn it on.

  • I just confirmed this on a 2016 MBP. – bassplayer7 Feb 2 '17 at 15:56

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