Why cannot the brightness of the POCO C61 be adjusted in real time according to changes in ambient light?

The POCO C61 does not have a built-in light sensor, and uses a front camera to realize the light sensing work. In order to optimize performance and prolong the battery life, the automatic brightness detection will not continue to work. It only works once when the screen is lit and off or the automatic brightness function is switched on and off. If you need to use automatic brightness adjustment, please turn on this function first. When you need to automatically adjust the brightness, press the power button to turn off the screen and press the power button again to light up the screen.