[alsa-devel] Should "Master" control the "Line In" volume (loopback)

[Raymond Yau]

2011/1/24 Takashi Iwai <tiwai at suse.de>

> At Sun, 23 Jan 2011 17:37:07 +0000,
> Colin Guthrie wrote:
> >
> > Hi,
> >
> > I have a question-by-proxy from a user who is confused because his
> > "Master" kcontrol is affecting the volume via Line In (which he uses to
> > loopback an analog signal to his speakers).
> >
> > I've not got much hardware here for comparison, but I'm pretty sure that
> > Master usually doesn't affect Line In.
> >
> > So couple of questions:
> >  1. Is it typical that Master affects Line In?
>
> Yes, but only for the loopback volume.  It's independent from the
> line-in capture volume.
>
>

>> ALSA info here: https://bzattachment.mandriva.com/attachment.cgi?id=18170

>> (for reference the full bug is here:
>> https://qa.mandriva.com/show_bug.cgi?id=62218<https://qa.mandriva.com/show_bug.cgi?id=62218>
)

>> (1) KDE kmix is now pulseaudio aware and as such, kmix does not show the
>> individual channels in the mixer
>> I have my Sirrus/XM satellite radio plugged into LINE-IN and I listen to
it
>> while using the computer.

"virtual master" already have "Front" and "Headphone" as slaves

if the user want to hear the satelite radio from LINE_IN

Why Kmix does not control those  "Mic Playback" and "Line Playback" any more
?


The max dB of Line and Mic playback volume are +12dB while those slave
volume controls are only +3dB


	control.1 {
		comment.access 'read write'
		comment.type INTEGER
		comment.count 2
		comment.range '0 - 63'
		comment.dbmin -9150
		comment.dbmax 300
		iface MIXER
		name 'Front Playback Volume'
		value.0 61
		value.1 61
	}

 control.3 {
		comment.access 'read write'
		comment.type INTEGER
		comment.count 2
		comment.range '0 - 63'
		comment.dbmin -9150
		comment.dbmax 300
		iface MIXER
		name 'Headphone Playback Volume'
		value.0 61
		value.1 61
	}


	control.11 {
		comment.access 'read write'
		comment.type INTEGER
		comment.count 2
		comment.range '0 - 31'
		comment.dbmin -3450
		comment.dbmax 1200
		iface MIXER
		name 'Line Playback Volume'
		value.0 28
		value.1 28
	}



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