When you enable [Auto] in the brightness settings, the light sensor of the Xiaomi Smart Band 10 can make a real-time monitoring of the ambient brightness. This is not a product issue, and you can use it with confidence. A new version will be released later for optimization.
For your reference, here are more details about the stepwise change in brightness adjustment of the device:
1. In daily life, the ambient brightness varies greatly, and there is a small probability that the light sensor can’t adjust the brightness to the desired level at one time, resulting in a stepwise brightness change effect;
2. Sensor misreading can cause frequent brightness changes or too fast response. The sensing results can be affected by occlusion, dust, or film.