Regarding the auto brightness feature on my Kindles (Voyage that I've had for a number of years and Oasis 2 that I purchased recently)--I find I really like the auto brightness after using it for awhile. After initially turning it on, I make manual adjustments when I don't like the light level and the Kindle adjusts to my preferences so that eventually I don't need to make any adjustments.
My Kobo Aura One also has an "auto brightness" setting that I finally ended up turning off. It just didn't work as well as it does on the Kindles and would often adjust to levels that made it difficult, if not impossible to read.
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