While testing Windows 7 on an Apple MacBook Pro system, I noticed that sound didn’t work at all. Of course, this was after I installed BootCamp drivers and everything was working (more or less as expected) except the sound.
What’s the solution? I found it here. In essence, the solution consists of running the
RealTekSetup.exe binary from the Leopard DVD using “Troubleshoot Compatibility“, telling it that “The program worked in earlier versions of Windows” and that it worked fine in “Windows Vista“. After it has been installed no reboot it’s even needed!