MacBook screen turns off when setting brightness one notch below maximum When I press the lower brightness key (F1) on my MacBook the screen turns off (pitch black). When I raise the brightness back (F2) everything is fine again. This only started happening recently with this machine and I can't think of anything that I've changed that could have caused this.


macOS Sierra 10.12.4
MacBook Pro (Retina, 13-inch, Mid 2014)
Restarting the computer resolved this. ¯_(ツ)_/¯