http://www.intel.com/support/motherboards/desktop/sb/CS-034206.htm
for desktop to support multistreaming
headphone and line out must use different audio output and different
volume control
in this case , internal speaker of business desktop is better share
volume control with line out
there is a bug in function indep_hp_possibel() hda/hda_generic.c which
return true when line out and headphone share the same audio output
/* assume no path conflicts unless aamix is involved */
if (!spec->mixer_nid || !is_nid_contained(path, spec->mixer_nid)) {
return true;
}
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https://bugs.launchpad.net/bugs/1254884
Title:
Pulseaudio: incoherent muting of GStreamer channels (mutes master,
headphone and speaker, but unmutes only master)
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