I do not want my laptop to change brightness when my laptop power is plugged in or unplugged. I set my brightness based on how bright my surroundings are. If I am in a dark room, I set my brightness very low and when I plug my laptop in the brightness gets set to maximum which is way to bright and will not go down even if i press the button.

My laptop is a Sony Vaio E Series, SVE15118FGW


Open System Settings -> Brightness and Lock and uncheck the Dim screen to save power option.

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