Actually, the very latest alsa drivers might contain a setting for auto-mute. 
Would it be possible for you to follow these instructions:
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules , reboot, start 
alsamixer and see if you have an "auto-mute" setting, and if so, make sure the 
setting is right, then test again? 

Thanks!

** Changed in: alsa-driver (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/754964

Title:
  [HP Z200] Internal Audio not muted

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