Disable this option and your Mac won’t do this. To find this option, open the System Preferences window from the Apple menu and select “Displays.” Enable “Automatically adjust brightness” and your Mac will use the ambient light sensor to automatically adjust the brightness. This means making the display brighter when it’s bright near you, and making the screen dimmer when you’re in the dark.
Macs with built-in ambient light sensors can monitor the light level nearby and automatically adjust the display’s brightness level to be suitable. How to Automatically Adjust Brightness Based on Ambient Light However, you can adjust your Mac’s display brightness to your desired level, and this option will adjust the display brightness to be slightly dimmer than the brightness you choose. Unlike on Windows, you can’t customize the exact display brightness levels your Mac uses when it’s plugged in and unplugged here.
Enable the “Slightly dim the display while on battery power” checkbox under the Battery tab to make your Mac’s screen dimmer when on battery power, or uncheck it to prevent your Mac from dimming the display automatically. Just remember that unchecking it might drain your battery faster. To enable or disable this option, open the System Preferences window and click the “Energy Saver” icon. This helps increase your MacBook’s battery life. Your MacBook can automatically change its screen brightness when you’re on battery power, dimming your display when you’re on battery and making it brighter when you’re plugged in. RELATED: How to Increase Your MacBook's Battery Life How to Automatically Dim the Display When You’re Not Plugged In You may find dedicated “brightness up” and “brightness down” buttons, or you may have to press a “menu” or “options” button and locate this option in an on-screen menu. Look for physical buttons on the display itself, often located near the power button. If you’re using a third-party display, you’ll need to adjust the brightness on the display. However, these keys won’t do anything and you won’t have a “Brightness” slider in the System Preferences window if you’re using an external display not made by Apple. If you’re using an external display made by Apple, you may see a “Brightness” slider in the System Preferences window and be able to control the brightness of your display using the keys on your keyboard. How to Adjust Brightness Manually On an External Display To do so, click the Apple menu and select “System Preferences.” Click the “Displays” icon in the System Preferences window and adjust the “Brightness” slider to your desired level.
In this case–or if you just prefer using your mouse–you can adjust brightness in OS X, too. If you’re using a different keyboard with your Mac, you may find the brightness keys in a slightly different place, or you may not see any brightness keys at all.
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