"Adaptive brightness" refers to a feature that automatically adjusts the brightness level of a device's screen based on the surrounding lighting conditions. Full definition
Adaptive brightness setting works well, and rotation is possible for 90, 180, and 270 - degree. (phoneradar.com)
Once I turned adaptive brightness off, the screen became bright, clear, and well - lit for video. (pcmag.com)
Turn adaptive brightness off and the slider moved back to the middle, and turning it up to max revealed a much brighter top end than we'd otherwise have had. (techradar.com)