Auto dimming; gone?

Hi all,
I could have sworn my 3gs originally had auto dimming feature. Now, it is constantly displaying it's brightness and terribly wearing down the battery life.
I see that there is a "auto-brightness" option, but that does not control the dimming aspect. I am running ios 5.01. This must be a new bug. Not sure when it started. Anyone???

Ingo,
You indirectly helped to solve my problem. No, a hard reset of my phone was not the solution. It's been suggested to me before and it failed. The suggestion of the autolock feature got me thinking. As you stated, the autolock will dim once you set the time for delay; but, of course, I didn't want to have to enter a passcode evertime I wanted to use my phone. Simple, turn off passcode. Problem solved.
Thanks.

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Auto dimming; gone?

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