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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/754964 Title: [HP Z200] Internal Audio not muted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/754964/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs