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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