Turn off adaptive brightness

Adaptive brightness is one of those features that sounds great as a concept but rarely works as advertised. I found the constant brightness fluctuation to be too distracting and any battery life boost didn’t make up for it. It didn’t take long for me to disable the feature, and once I had, it remained off throughout the weeks I tested the Steam Deck.
If you need to adjust the brightness, you can do so from the quick settings or use the button combo trick described on the next slide…