On Wed, 2016-03-09 at 00:28 +0800, Raymond Yau wrote: > > > Alsa mixer api just combine volume control and mute switch with same name > > > to an element, > > > > > > Is it possible that  these two control have different number of channels > > > for some sound card ? > > I don't know if it's possible, but the PulseAudio code works in any > > case, because the switch handling code doesn't depend on how many > > channels the corresponding volume element has. > > > Do you mean that side speakers still have sound when selecting 5.1 profile > when user have 7.1 speakers since alsa snd hda intel driver use copy front? I don't know what "copy front" means. I sure hope that it doesn't mean that the driver copies audio from the front speakers to the side speakers when pulseaudio uses the "surround51" device. -- Tanu
