[ Windows 7 64-bit ] External speakers / headphones not working

Hi,
I just upgraded from a MacBook 13.3" (Late 2008) to the brand new MacBook Pro 13.3" (Mid 2010). Sound wasn't a problem in Windows 7 64-bit on the old MacBook, but the new MacBook has somehow messed up the line-out signal to my external speakers (and headphones).
I obviously already tested everything in OSX and didn't find a problem. The internal speakers also work fine in Windows 7 64-bit, but as soon as I connect external speakers (and headphones) in Windows 7 64-bit there's just silence. The speakers are powered, and the playback sound device information (and the volume bars) suggest that all sound devices are working normally, i.e. Speakers, Headphones and +Digital Audio (S/PDIF)+. The chipset is Cirrus Logic CS4206A (AB 13).
Has anyone else come across this issue, and if so, how did you solve the problem?

Hi,
After googling for two days, I finally found a workaround for my macbook pro 15'' (macbookpro5,3).
I had sound on Windows 7 64bits (with volume ok) and without the red light problem, but i couldn't hear anything from my tv with sound cable connected to headphones. My current version of bootcamp is 3.1 (with all drivers installed from it).
I tried all kind of things (drivers from vista64, xp, bootcamp 2.2, realtek, other versions of cirrus drivers, etc.) with no luck. THE SOLUTION FOR ME WAS TO INSTALL LATEST DRIVERS FROM NVIDIA (YES, graphics drivers) OVERRIDING THOSE FROM BOOTCAMP 3.1. After macbook restart, MY EXTERNAL SPEAKERS STARTED WORKING!!!
Hope this helps to anyone.

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