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iOS devices use an ambient light sensor to adjust brightness levels based on the light conditions around you. The sensor lowers brightness in dark locations and raises brightness in light locations. The auto-brightness feature is on by default. However, those who did not want to use the feature can go to "Display & Brightness" under settings and toggle it off, but that's no longer the case in iOS 11.
The iOS 11 software update brings many positive changes to our iPhones and iPads. However one feature that has been annoying many users involves the Auto-Brightness feature. With iOS 11 Apple has relocated the Auto-Brightness toggle, making it harder for users to get to it. This was done to discourage users from turning this feature off, as it can negatively affect your device’s battery life.
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The auto-brightness setting has a new home in iOS 11 onward, now contained within the Accessibility section of the Settings app, here is where it can be found:
Step 1 : Open the "Settings" app and go to "General" and then to "Accessibility".
Step 2 : Choose "Display Accommodations".
Step 3 : Find the setting for "Auto-Brightness" and toggle OFF or ON as needed.
Method 1. Adjust brightness in Control Center.
Step 1 : On an iPhone 8 or earlier, iPad, and iPod touch swipe up from the bottom edge of your display. On an iPhone X, swipe down from the top-right corner of your display.
Step 2 : Drag the brightness bar up or down to adjust the brightness.
Method 2. Adjust brightness in Settings.
Step 1 : Go to Settings > Display & Brightness.
Step 2 : Drag the slider to the right or left to adjust the brightness.
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