How to Fix Auto-Brightness Issues on iPhone

iPhone automatically adjusts screen brightness based on ambient light, but it doesn’t work as well as some would like. Luckily, ambient light sensors can be manually adjusted to behave correctly. Auto-Brightness can be reconfigured to properly respond to changing light conditions by following a few easy steps.

Users can turn Auto-Brightness off completely if they wish, but we recommend resetting and leaving it on for a few minutes for the best experience and to avoid eye strain.

How to Fix Auto-Brightness

You’ll need both a bright flashlight and a dark room to properly configure your iPhone’s Auto-Brightness. These two things help configure the light sensor for iPhone to set up properly.

Tap to start the installation process.

Scroll down and select

Tap on Brightness and Wallpaper

By default the screen should look like this:


Then go to a dark room with your iPhone and return. With Auto-Brightness disabled, you can now adjust how the brightness level responds in the dark. Adjust the level to the brightness you want the screen to be dark and wait a few seconds for the settings to be saved.

Set Low

Next, turn on the flashlight and point it close to the iPhone’s front-facing camera. Adjust the brightness slider to full brightness or near full brightness. This way the Auto Brightness will increase when you are outside on a sunny day. Once the slider is set to a bright setting, wait a few seconds for the new configuration to be saved.

Set High

Either turn on the light or leave the room and turn it on The new settings should be applied and you will see the brightness begin to adjust.


This new Auto-Brightness configuration will help save battery life by keeping the screen at a lower brightness. Resetting Auto-Brightness in this way can help resolve situations where the setting is not working as it should.

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