Change Screen Brightness on all screens macOS

December 28, 2016   

For years I have wondered if there is a way to change the brightness on my external Apple LED Cinema Display which is connected via display port to my MacBook Pro. By default the brightness key on the function row of the keyboard only changes the brightness of the built-in Retina Display.

If you want to change the display brightness of your external display hold the Control key while pressing the F1/F2 keys on your keyboard. This will change the brightness only on the external display.


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