Bootcamp win7 secondary screen brightness

Hi,
I have a macBook pro with bootcamp (win7-64) and a secondary screen connected trough the hdmi. The brightness of the secondary screen changes constantly, seems related with the content of the same screen. For example, if i have opened a photo, wich is mainly dark, and I maximize a program like Word, which is mainly white, the brightness changes a lot. this problem doesn't happen in laptop screen.
The win7 brightness control seems to affect the laptop screen only.
How to disable this annoying secondary screen brightness auto adjust?
Thanks

This seems like it applies:
http://support.apple.com/kb/ht4122

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The cause
=========
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I've read many posts from people who had the same problem I encountered: t
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Hello Roma89,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that since you upgrade from Windows 7 Home to Windows 7 Ultimate you have been unable to adjust the screen brightness using the Functions keys. I would suggest that you download and install the newest version of the HP Support Assistant which if you follow the HP Support document: Using HP Support Assistant (Windows 7) should get you all the newest drivers for your computer.
Please re-post if you have any further issues. Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
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Bootcamp win7 secondary screen brightness

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