It is just totally broken in (my) Pixel 2 non-XL. If I set brightness at 100 with auto brightness enabled, it will never get dark in a pitch black room. It'll only dim down to maybe 50. If I put brightness at 10 with auto brightness enabled, it'll stay that dim. It doesn't ever adjust as it should to changes in light / environment. It adjusts, but very wonky and not properly. I previously bought Lux for my old HTC 10 that did the same thing and it helped to a certain degree. But I remember the auto brightness still was wonky. May try it on the Pixel 2. But a cell phone in 2017 should be able to properly handle brightness on its own. Major issue for me that probably will prevent me from keeping the phone.