Imac with AMD Radeon 6770m chipset will not allow brightness adjustments in Bootcamp Windows 7

I've encountered a Video Issue with the new Imac 22" Cinema display units that have the integrated AMD Radeon 6770M chipset when booted to Bootcamp Windows 7 (no difference what version) Enterprise edition in my case. I am unable to adjust the brightness intensity that is currently locked at full brightness.
In the past the Apple keyboard would easily adjust the brightness or I could use the Bootcamp Control Panel and use a slider to change the brightness settings. The keyboard function keys (F1 and F2) pop up the brightness control options and shows the onscreen slider moving as I am changing the display setting but there is no actual brightness change. The Bootcamp Control Panel has actually removed the Brightness Tab as if to indicate this freature is not available. (Bootcamp version 3.2 and 3.3). I can Image this Win 7 copy to an 21" Wide Screen 2009 release of the Imac that has a Nvidia Chipset and the Bootcamp Control Panel now displays the Brightness Tab AND the Keyboard control option works perfectly.
Suggestions?
Pete

You're probably seeing bad performance because you don't have the latest graphics drivers installed. The ones provided by Apple's Windows support software are long out of date. Going to AMD's main website and navigating to the download section won't get you the correct files. This is a direct link to the proper driver.
http://www2.ati.com/DriverS/mobile/12-10_mobility_vista_win7_win8_64_dd_ccc_whql _net4.exe

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Imac with AMD Radeon 6770m chipset will not allow brightness adjustments in Bootcamp Windows 7

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