Brightness setting on 2.2

I recently got a replacement 2G iphone as well as updated to 2.2 from 2.1. The brightness setting now is much dimmer than all previous version of iphone os. Auto brightness seems to be malfunctioning in 2.2. The screen does not adjust to a brighter setting when I step into a dark room.
I just want to find out whether it is the OS 2.2 that has a brightness bug or its the replacement 2G itself that has a bad light sensor???

Yes the auto brightness is on. I tried turning off then on again, off reset then on, hard reset. Nothing seem to aliviate the issue. I can put my thumb over the sensor bythe ear piece and the brightness level stay at really dimmed. Then sometimes when there good light, the screen is real bright. Like right now I'm typing this under a 100w flood buld and my screen is way up!?!?
The brigtness adjustment is definitely different on 2.2 vs. al prevous vrsion. I used to be miserly turn my slider at 1/8 way to save batt. But since upgrade to 2.2, I have to be at least 1/3 way up, with the auto brightness on.
I think it's hw issue but jus want to see if other have same issue on 2.2.

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