This detects the amount of light where you are and adjusts the display brightness accordingly. The function keys on your Mac keyboard are useful as they give you the ease of controls for screen brightness, volume, media playback, Mission Control, Launchpad, and more. By holding Control, you’ll notice the brightness change on your LG Since upgrading to High Sierra Mac OS 10. Control–Brightness Up or Control–Brightness Down: Change the brightness of your external display, if supported by your display.
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