iPhone Brightness Keeps Changing in iOS 11/11.1/11.2? Fixed Here!

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Cedric Grantham Updated on Jun 05, 2018 to iOS & Mac Topics | How-to Articles

“Is anyone else having these issues? I keep setting my iPhone to brighter and it automatically moves it back down to a lower brightness after updating to iOS 11. Can anyone help me fix this problem soon? Thanks!”

As the issue demonstrated above, many users with the old iPhone devices, like iPhone 6, 6S, 7, 7 Plus have found some problems are occurring on there devices after updating to iOS 11 on the day it was released. The issues are disparate but all related to iOS updating, such as iPhone screen recording not working, iPhone live wallpaper won't display properly or iPhone brightness keeps changing we will discuss in this post. Keep reading to see how to fix iPhone brightness keeps dimming or going up/down by itself in iOS 11.

5 effective fixes to iPhone brightness keeps changing in iOS 11/11.1/1.2

Based on what we've known, the iPhone brightness keeps changing in iOS 11 is mostly caused by Auto-Brightness feature on iPhone or the iOS bugs problem. Try to fix it with methods below.

1. Disable auto-brightness on iPhone

If you have enabled auto-brightness on your iPhone in iOS 11, your iPhone will use a light sensor to adjust brightness based on your surroundings, which means the brightness will keep changing by itself. You can disable this ambient-light sensor by:

Going to "Settings" > "Display & Brightness" > find "True Tone" and turn it off.

2. Reset the brightness

After you have disabled the light sensor mode, you can reset your iPhone brightness to check your iPhone brightness keeps changing or not. Do it in two ways:

  • Go to "Settings" > "Display & Brightness" > slide right or left to adjust the brightness based on your own needs.
  • Swipe up from the bottom of your iPhone screen to activate the "Control Center" in iOS 11, find the brightness button and adjust it to the best state.

3. Restart your iPhone

If your iPhone brightness still keeps changing in iOS 11 after you have turn off the True Tone feature, you can try to restart your iPhone to fix the issues caused by running cash, like iPhone notification not working in iOS 11.

Restart iPhone 6/7/8: Press and hold the "Sleep/Wake" button until the red slider shows up, then drag the "slider to power off". After 30 seconds later, press and hold the "Sleep/Wake" button again until the Apple logo appears on your iPhone.  

Restart iPhone X:  Press and hold both Side button and Volume Down ( or Volume Up) buttons at the same time until you see the slider. Drag the slider to shut down your iPhone X completely. After 30 seconds later, press and hold the "Sleep/Wake" button again until the Apple logo appears on your iPhone.  

4. Update to the latest iOS version

If your iPhone brightness keeps going up and down or keeps dimming all the way can be solved by using the methods below, you can update to the latest iOS version to troubleshoot if the matter is iOS-related.

Go to "Settings" > "General" > "Software Update" > check whether there is a new version or not. If yes, tap "Download and Install" to start to install the latest iOS 11 version on your iPhone.

5. Restore your iPhone

The final way deserves to try is to restore your iPhone from a backup. You can restore your iPhone from iCloud backup or restore from iTunes backup. To make sure everything is alright, we suggest you use the latter way. Go to check how to restore iPhone from iTunes backup on another page.


Many unexpected matters are happening on your iPhone in daily use, some are small without any potential threat while others are serious that can cause iPhone data loss, such as iPhone is stuck on recovery mode or iPhone is attacked by the virus. Then, it is indispensable for you to back up your iPhone on a schedule with iTunes, iCloud or a third-party iPhone data manager. If you want to transfer data from iPhone to PC without using iTunes or iCloud any more, you can try EaseUS MobiMover Free, the most popular and totally free iPhone data transfer software in the world enables you to export iPhone contacts, messages, notes, calendars, voice mails, books, Safari bookmarks & history, photos, videos, and audios to the computer in Windows 7, 8, 8.1 and 10 in simple one-click. Download and try EaseUS MobiMover Free to protect your iPhone NOW!
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Step 1. Connect your iPhone to your computer running Windows or Mac OS systems with a USB cable. Tap "Trust" on your iPhone screen. Run EaseUS MobiMover on your computer, and select the "Phone to PC" to help you back up iPhone data to Window PC. Click "Next" to continue.

how to back up iPhone without iTunes - step 1

Step 2. MobiMover enables you to transfer all the iPhone files at once, including photos, videos, movies, music, playlist, ringtones, books, contacts, messages, notes, voice memos, and more. you can choose all or optionally export a specific data type by ticking the boxes. Having chosen the data to be exported, the next thing you can do is to customize the storage path on your computer, otherwise, the transferred data will keep on your desktop by default. Once one, click "Transfer".

how to back up iPhone without iTunes - step 2

Step 3. MobiMover will start immediately to back up iPhone files to your PC/Mac/laptop without requiring iTunes. Wait patiently until it finishes.

how to back up iPhone without iTunes - step 3