Auto brightness not working on iPhone 5?

On the iPhone 5 - In the settings, when flicking the auto brightness on/off the screen shows no change in brightness - whether in a completely dark room or with the lights on etc. My iPhone 4 has been updated to IOS6 and seems to be working normally (brightness auto adjusts in all situations).
Anyone else have this problem of the auto brightness not working?

There is nothing wrong with the auto brightness.
When you have auto brightness enabled the slider works as the minimum brightness setting with auto brightness.
If you have the slider too high the brightness cant reduce because youre not letting it.
Set your brightness at about 25% and you'll see what I mean.

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