S6. No auto brightness. I keep it quite low in fact cause it's already plenty bright (this screen truly is tremendous).
The best thing, though, is if I'm outdoors in sunlight, and can't see, I crank it up full power, and the screen shines through. It's lovely.
Here's where my screen brightness is at:
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Auto brightness on my S6 Edge is pretty good, I'm finally impressed. I keep my Note 4 on max brightness, the battery life is just that good.
How does she brightness affect battery? Does it tax it more?
The brighter a light needs to be the more power it needs to use (to be brighter).
I mean the actual method which the phone judges whether it needs to go brighter or not, does that tax the battery? Constantly checking the lighting in the environment and whatnot?
You mean how auto brightness works? Yes there's a sensor that is active that is used for that. How taxing that itself is on the battery is something I'm not completely sure of, or whether or not the sensor isn't even used for other things even if auto brightness is disabled (meaning that on its own might not save the sensor from being used).