But some users prefer to have complete control over their Mac’s screen brightness and don’t want the system to change it for them. (If you’re on a beach with your iMac instead, well… kudos to you). And if you’re on a sunny beach with your laptop, it will automatically illuminate its screen to improve visibility.
In a dimly lit room? Your screen will darken on its own so you don’t blast you off your couch with its insane light levels. your Mac’s screen brightness accordingly.
Your Mac uses a built-in ambient light sensor to detect the brightness of the room and can then automatically increase or decrease the brightness. But you may also have noticed that by default your Mac’s screen automatically adjusts its brightness levels. Owners of Macs with built-in displays are likely aware that the screen brightness can be changed through the function keys on the keyboard or in the macOS user interface through System Preferences or a third-party utility. The How to Turn On/Off Auto-Brightness on MacOS
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