Comment 20 for bug 1254884

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Raymond (superquad-vortex2) wrote : Re: Pulseaudio: incoherent muting of GStreamer channels (mutes master, headphone and speaker, but unmutes only master)

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths/analog-output.conf.common

element pcm only exist in analog-output.conf.common
but switch = mute
try change mute to on

[Element PCM]
switch = mute
volume = merge
override-map.1 = all
override-map.2 = all-left,all-right