Thoughts about setup and deployment issues, WiX, XNA, the .NET Framework and Visual Studio
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herein are my own and not those of my employer, Microsoft.
There is a known issue in Update Rollup 2 for Media Center 2005 that causes 5.1 analog surround sound to revert to 2 channel mode. The underlying issue is that a registry setting is being overwritten by Media Center. You can use the following steps to add the registry value needed to fix this issue:
Note that if you re-run the Speaker Setup portion of Media Center Setup, this registry value will be reset again and you will need to re-run the above command to fix the underlying issue once more.
This issue was previously described on this NVidia support page, but I wanted to list it here as well in case anyone reading my blog runs into it as well.