Auto-adjustment of the phone/tablet screen brightness does not work

Auto-adjustment of the phone/tablet screen brightness does not work

Perform the following to troubleshoot:

Make sure that Automatic or Auto-brightness has been enabled

Open Settings, search for and access Automatic, and verify that the switch has been turned on.

Disable and then enable Automatic or Auto-brightness

If you tried to adjust the brightness of your screen manually when Automatic is enabled, the phone/tablet system will record this manual adjustment as your preferred brightness level. When there are subsequent changes in lighting conditions the next time, your phone/tablet will automatically adjust to this level. Disabling and then enabling Automatic will erase the brightness level preference saved on your phone/tablet.

Check whether the brightness has been adjusted in a third-party app

If you have adjusted the brightness in a third-party app (such as a video player or web browser), your phone/tablet will stop adjusting the brightness automatically according to ambient light levels, as the third-party app is now in charge of brightness control. Exit the third-party app and auto-brightness will take effect again.

Check whether you are using a colored protective film

It is recommended that you use a transparent protective film. A colored protective film will cause the proximity sensor to be blocked, leading to the automatic brightness function not to work properly.