Steve758 wrote:
Historically laptops have an auto brightness feature that adjusts the luminence value based on the ambient light in the environment that its in, making it almost impossible to set and maintain a profile.
My suggestion is to purchase an external monitor which can be attached to your monitor allowing you to set a profile for that monitor. I have an external monitor on this computer, works great.
Hope this helps.
It can be done on modern laptops, auto brightness can be turned off.