BrightnessControl writes brightness-nits only to a backlight service that carries force-brightness-control; AdrenoBacklight now publishes it (SnapAdreno 9cc1e92), so CoreBrightness's slider and keys reach the panel instead of dimming in software (next1b: RequestsNits 0). The floor drops from 10% to 2% (level 41 of 2047) and nits map proportionally onto levels.