Well shucks, I guess Samsung lied to me! I see adaptive brightness was released as part of Android Pie in 2018.
Yeah, I was thinking it could be machine learning in that it takes the average of all your changes over time and the different ambient light levels.
But deffo no need for neural networks.
So I was trying to think how I’d implement it, and I agree if it’s simple then it really only needs to set the brightness level once, then remember if the user adjusts it, and reuse that adjustment for every lux reading.
Hence the example I gave: