auto-brightness not working?

If I move the slider then turn the auto brightness on it pretty much stays at that brightness. If I put the slider down to nothing and toggle auto on it just stays just as dark and might change just a hair but nothing to noticeable. Does anyone else have this problem?

 

well it does change a little bit, but if i put it on full brightness it stays on full brightness if i do that test. If I put it on lowest brightness it will stay that dim. If there was a min or a max setting then mining or maxing it would have a effect. For example if it was a max setting then if i put it to full brightness then it should change the screen from all sorts of levels but instead it stays fully bright. The only time I notice a change is when its around the middle.
I feel like it generally stays in the area of where u set the slider. So if its in the middle it will stick close to the middle setting and wont stray away to far from it, instead of a min max kind of thing for me.

 

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