Brightness Adjustment in Windows XP

I'm running bootcamp with windows XP NTFS partition on the macbook pro core duo with ati x1600.
Whenever I adjust the brightness the first click down from the max brightness "jumps" down to half as bright, and then the rest of the clicks, with the brightness adjust buttons, gradually get darker. When I boot OS X, the brightness adjustment is gradual the whole way.
I checked to see if maybe it was just because I wasn't running Leopard, but my mom is running tiger as well, and her brightness adjustment in Windows XP is gradual, the way its supposed to be. She also has the core 2 duo macboook pro with the nvidia 8600gt and not the original core duo like me.
What could be causing this problem? Are the ATI drivers not the most compatible with bootcamp or something? I'm using their drivers on the amd.com page specifically made for bootcamp->core duo.
Any help would be appreciated.
Caleb

I believe that this is an existing issue. I am also using a Macbook Pro with ATI x1600 video card. The brightness adjustment is 50% at first click and then gradual. I too have all the recent updates as far as the drivers are concerned.
To confirm your statement on Nvidia video card.... macbook pro's equipped with this card do not have the brightness adjustment issue that we are reporting.
Axel F.

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