I have a Dell XPS 420. I've installed Windows 7 RTM (x64)
I have this audio device: SIGMATEL STAC 92XX C-Major HD Audio
I have tried using the windows 7 basic driver, and also the Vista 64-bit driver from Dell's website (details):
Date: 10/29/2007 Version: 126.96.36.19911, A04 File Size: 7 MB
With both drivers, I get normal stereo sound from the driver, but my 5.1 surround sound doesn't work. Has anyone experienced this? Is there a fix?