it mainly depend on the number of volume controls and mute switches in the hda codec
you have to post the output of alsa-info.sh 1) Two channels hda codec (e.g. ad1984, ...) 2) Four channels hda codecs which support 2+2 (e.g alc26x, ad1983,.. ) 3) Six channels hda codecs (e.g. ad1986, alc66x,..). 4)Eight channels hda codecs(e.g vt1708s, ....) 5)10 channels hda codecs support 7.1+2 (e.g alc88x, ad1988, ....) ** Changed in: pulseaudio (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/1254884 Title: Pulseaudio: incoherent muting of GStreamer channels (mutes master, headphone and speaker, but unmutes only master) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1254884/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs