If I turn the Motion Lightning ON then Cell Light, Contrast, Brightness are all remain untouched in the menu but the picture becomes significantly brighter. It sets Cell Light to 20 (there is no change in brightness if I start from Cell Light 20)
Motion Lightning indeed resets to OFF if I touch those controls. However, it doesn't seem to kill the Contrast/Brightness calibration.
Hahh! But I had to readjust my Brightness AGAIN. It seems I have to recalibrate this setting almost every day. It must be correlated with temperature or more likely with this random autodimming sh#t...
I guess Mortion Lightning solves the brightness problem by setting the Cell Light to 20 and keep it there unless Motion Lightning itself want's it otherwise.
The other feature I know to set Cell Light is the ECO Sensor. May be it still works in the background even if you disable it from the factory mode service menu.
Another notable thing that I have ZERO brightness problems after a fresh factory reset, so it must be a stuck setting somewhere which gets activated on reboots (even if you can't see either the change of the setting or the setting itself...)