What if Huawei's mobile phone screen can't sleep?

If the sleep time setting item of the mobile phone is grayed out, it cannot be set.

It may be that your mobile phone has turned on power saving mode or low battery mode. In order to prolong the service life, when the power is lower than 20%, it will prompt to start the power saving mode or low power mode, and the sleep time will be set to 30s (if it is already set to 15s, it will be kept at 15s).

Solution:

Please turn off the power saving mode switch: enter the settings, search and turn off the power saving mode.