• Try installing pending updates and restarting your iPhone to fix issues caused by bugs and glitches.
  • Disable and re-enable the auto-brightness feature on your iPhone.
  • Make sure the low light mode is turned off on your iPhone.

Try Basic Fixes

  • Remove the screen protector: Your iPhone uses the built-in ambient light sensor to detect your current lighting conditions and adjust the brightness accordingly. A poorly applied screen protector may block that sensor. Hence, you should first try removing the screen protector.
  • Clean your iPhone: Use a soft, dry cloth to clean the ambient light sensor located at the top of the notch. This should help remove any sweat or oil that may have been covering the sensor.
  • Install iOS updates: A buggy or outdated iOS build could also give rise to such problems. Hence, it’s a good idea to install any pending iOS updates on your iPhone.

Fix 1: Toggle Auto-Brightness

Another thing you should do is disable and re-enable the auto-brightness feature on your iPhone. Here’s how:

Step 1: Open the Settings app on your iPhone and head to Accessibility > Display & Text Size .

Step 2: Scroll down to the end of the page and turn off the switch next to Auto-Brightness .

Accessibility Settings on iPhone 4 - 1

Fix 2: Disable Low Light Mode

If you’ve been using the Screen Zoom feature on your iPhone to enhance readability, it could be preventing the auto-brightness feature from working correctly. Specifically, if the low light mode is enabled, it will consistently keep your iPhone’s brightness low. Here’s how to change that.

Step 1: Open the Settings app and head to Accessibility > Zoom .

Step 2: Make sure Zoom Filter is set to None .

Zoom Accessibility Settings on iPhone - 2

Fix 3: Turn Off Night Shift

Similar to Screen Zoom, the Night Shift feature can also interfere with the auto-brightness function and cause it to stop working on your iPhone. If you’ve been using this feature to reduce blue light, consider disabling it with the following steps:

Step 1: Launch the Settings app and go to Display & Brightness .

Step 2: Tap on Night Shift and turn off the toggles next to Manually Enable Until Tomorrow and Scheduled .

Display and Brightness Settings on iPhone 3 - 3

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