9 Tips to Fix iPhone Display Brightness Keeps Changing

To fix the issue of iPhone display brightness keeps changing, the article gives you 9 tips. After reading, you can learn how to solve the iPhone screen brightness error.

Clara by Clara Updated November 14, 2023
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Why Does My Screen Brightness Keep Changing on iPhone?             

Have you ever encountered the problem of iPhone display brightness keeps changing? This problem may bother you, especially when you are using your phone, where sudden brightness changes may affect your experience. There could be some reasons why the screen brightness on your iPhone keeps changing: Auto-Brightness settings, Battery settings, Software update issues, and so on.

iphone display brightness keeps changing

In this article, we will share 9 tips to help you solve this iPhone screen brightness error. Whether it's turning off auto-brightness, checking battery settings, or updating the iOS, we'll walk through the solutions one by one to help you find what works for you. Let’s take a look.

Fix: iPhone Brightness Keeps Changing with Auto-Brightness off

Below are the 9 tips to help you address the problem of the iPhone screen brightness keeps changing. Continue reading and try these useful solutions.

Tip 1. Check the Auto-Brightness Feature Again

When you meet this problem, the first thing you should do is double-check the Auto-Brightness feature. Make sure you have already closed it, because it can automatically adjust the screen's display brightness based on the around light conditions. 

So, if your device screen keeps dimming, follow the steps to check the brightness setting on the iPhone: Open the Settings app > Swipe down and select Display & Brightness > Remove the switch next to Auto-Brightness to turn it off.

iphone display brightness keeps changing

Tip 2. Disable the Night Shift Feature

Another setting that is worth your attention is the Night Shift feature, which is used to adjust the color warmth of the iPhone screen. Maybe you open it to protect your eyes, and this can affect the brightness of your screen. If you don’t want to your iPhone keep going down, you can turn off the Night Shift by following the steps:

Step 1. Navigate to the Settings app on the screen > Locate the Display & Brightness.

Step 2. Select the Night Shift > Turn off the "Scheduled" & "Manually Enable Until Tomorrow" options.

After that, you can check if your iPhone display brightness working normally. If not, go ahead to the next solution.

Tip 3. Close the Low Power Mode

Your iPhone may automatically enable Low Power Mode when your iPhone's battery is low. This feature can reduce screen brightness to save power. Once the Low Power Mode is disabled, your iPhone will regain its normal performance and functionality, which may resolve the issue of iPhone display brightness keeps changing.

To have a check and turn off Low Power Mode: Open Settings > Scroll down to find Battery > Tap Low Power Mode and disable it.

iphone display brightness keeps changing

Tip 4. Keep the iPhone from Overheat

Excessive heat can also lead to screen brightness fluctuations on your iPhone. When your iPhone gets hot, it can impact its running performance and cause some malfunctions. So, you’d better take measures to prevent your iPhone from overheating. You can keep it away from direct sunlight, especially on hot days. Or close any unnecessary apps running in the background to reduce the strain on your device.

iphone display brightness keeps changing

Tip 5. Disable the Attention-Aware Feature

Disabling the Attention-Aware feature on the iPhone can also help with the issue of screen brightness constantly changing. The Attention-Aware feature uses the front-facing camera to determine if you are actively looking at the screen and adjusts the display brightness accordingly. Below are the steps to close it:

Step 1. Go to Settings > Locate Accessibility.

Step 2. Select the Face ID & Passcode.

Step 3. On this page, move the toggle option next to Attention-Aware.

iphone display brightness keeps changing

Tip 6. Turn off the True Tone Option

By turning off True Tone, you can disable its automatic adjustment function, which may prevent unwanted fluctuations in screen brightness. Notice that disabling True Tone may result in a slightly different visual experience, as the display won't adapt to changes in ambient lighting anymore. Here’s the guide:

Step 1. Open Settings > Click on Display and Brightness.

Step 2. Locate the True Tone option > Slide the toggle off.

iphone display brightness keeps changing

Now, you can check whether the question of iPhone display brightness keeps changing is solved.

Tip 7. Check the Auto-Lock on iPhone

Auto-Lock determines how long your iPhone stays active before the screen automatically locks and turns off. If your iPhone stays on for an extended period, the temperature will heat up and impact the iPhone display brightness.  

To solve screen brightness issues, you need to make sure the Auto-Lock is not set to a longer duration. You can adjust the Auto-Lock feature by the guide: Go to Settings > Display and Brightness > Locate Auto-Lock, then set it to never.

Tip 8. Restart Your iPhone

If this problem still exists, you can try restarting your iPhone. With a simple restart, you can resolve various software glitches that change the brightness of your screen. Check the steps to fix display brightness on iPhone 15/14/13/12/11 keeps changing:

Step 1. Navigate to Settings > Tap General > Click Power Off.

Step 2. Toggle the slider to power off the device > Wait for a while, restart your iPhone.

iphone display brightness keeps changing

Tip 9. Update the iOS to the latest

An Outdated iOS version may cause the screen display issues. If you forget how long before you last updated your iPhone, you can go to Settings > General > Software Update to check for any available updates. If there is an available update, then you can follow the on-screen instructions to download and install it.

iphone display brightness keeps changing

Tips: If your iOS is unable to check for update, you can follow the guide to figure it out.

Tip 10. Connect the Apple Support

If you have tried the aforementioned tips and are still experiencing issues with your iPhone brightness keeps changing, it may be beneficial to contact Apple Support for further assistance. Apple Support can provide personalized guidance and help diagnose the specific problem you're experiencing.

Remember to have your iPhone's serial number and purchase information available when contacting Apple Support, as they may require these to verify the iPhone and provide appropriate assistance.


That’s all about how to fix the iPhone display brightness keeps changing issue. To address the issue, the article provides you with 9 different methods, like checking the relative settings, restarting your iPhone, or upgrading to the latest iOS. You can try these tips one by one, or choose the ways according to your needs.

By the way, in order to avoid some unexpected situations, you can choose to back up your  iPhone to get rid of data loss. If this problem cannot be repaired, you can change to a new iPhone and transfer the old iPhone to new one.

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