MacBook display resets to maximum brightness

Hello,
after attaching an external display (Cinema display) to my macbook it automatically resets the LCD display of my MacBook to maximum brightness. After detaching the external display the maximum brightness setting remains on my MacBook.
Does anyone else have this problem? Does anyonoe know how I can preserve the brightness even when attaching an external display?
Thank you.

Hi everybody,
has anybody determined a solution for this problem yet? My wife has a MacBook that she uses at her desk with an external display. Every time she plugs or unplugs the external display the brightness of the built-in display reverts to maximum.
It's not really that big of a problem, we discovered that the brightness keys on the notebook itself always adjust the built-in display, even if it's not the primary display. The brightness keys on the external keyboard always adjust the brightness of the primary display (the external monitor in this case).
But non-the-less it's still an irritation. It would be nice if it was fixed.
Cheers,
Jens Petersohn

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MacBook display resets to maximum brightness

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