I'm having problems with the audio on my laptop. As far as I can tell, there's no muting from the Windows side.
Given I typically leave it muted, it could've been "broken" for awhile now. Ironically, I found this problem out while trying to play the StackOverflow podcast...
Edit: Response to first comment.
Contents of Sound, video and game controllers:
- Audio codecs
- Conexant High Definition SmartAudio 221
- Legacy Audio Drivers
- Legacy Video Capture Devices
- Media Control Devices
- Video Codecs