[alsa-devel] X-Fi Titanium: Capture is possible only with unmuted input

[Takashi Iwai]

At Mon, 30 Aug 2010 12:02:49 +0200,
Thor Kristoffersen wrote:
> 
> On Mon, Aug 30, 2010 at 11:45 AM, Takashi Iwai <tiwai at suse.de> wrote:
> > At Mon, 30 Aug 2010 11:43:14 +0200,
> > Thor Kristoffersen wrote:
> >>
> >> On Mon, Aug 30, 2010 at 11:32 AM, Takashi Iwai <tiwai at suse.de> wrote:
> >> >> On Mon, Aug 30, 2010 at 11:07 AM, Takashi Iwai <tiwai at suse.de> wrote:
> >> >> >> On Mon, Aug 30, 2010 at 10:46 AM, Takashi Iwai <tiwai at suse.de> wrote:
> >> >> >> >> >> I'm having issues with an X-Fi Titanium and ALSA.  The problem is that
> >> >> >> >> >> it appears to be impossible to capture without unmuting the channel I'm
> >> >> >> >> >> capturing from.
> >> >> >> >> >
> >> >> >> >> > What do you mean exactly "unmuting the channel I'm capturing from"?
> >> >> >> >> > If you mean to turn on/off "XXX Capture Switch", then it's a feature,
> >> >> >> >> > no bug.
> >> >> >> >>
> >> >> >> >> No, I mean that capture is possible only when mute=off and capture=on.
> >> >> >> >
> >> >> >> > Which mute?  Please be more specific.
> >> >> >>
> >> >> >> The signal I'm trying to capture is coming in through the SPDIF-i
> >> >> >> channel, so I'm talking about the mute and capture flags on that
> >> >> >> channel. However, I also tried the analog input (line), and the
> >> >> >> problem is exactly the same on that channel.
> >> >> >
> >> >> > Well, this is still unclear (what actually do you mean "channel") but
> >> >> > let me guess:
> >> >> >
> >> >> >  the recording from either mic or line-in doesn't work unless you unmute
> >> >> >  via "Front Playback Switch" mixer element.
> >> >> >
> >> >> > Correct?
> >> >>
> >> >> Not really. I use gnome-alsamixer, and there is a mixer element called
> >> >> "SPDIF-i" that has a slider, a "Mute" switch, and a "Capture" switch.
> >> >> I connect a digital source to the SPDIF input on the card, and then I
> >> >> try to record it with arecord from device hw:0,0. The only way I'm
> >> >> able to record sound is by setting the Mute switch (of the SPDIF-i
> >> >> mixer element) to off and the Capture switch to on.
> >> >
> >> > There is no mixer switch names "SPDIF-i".  It's cut in alsamixer's
> >> > display.  To check more exactly, make a diff of amixer outputs between
> >> > working and non-working states.
> >> >
> >> > But, what you wrote above is about the SPDIF input, not about the
> >> > analog input, right?  Let's focus on one of them first.
> >>
> >> The problem is exactly the same with the analog input,
> >
> > Hmm... what do you mean "exactly the same"?
> > Does "SPDIF-in" mixer have to be unmuted?  Or any other mixer element?
> 
> No, what I mean is that in order to capture sound from the analog
> input, it is necessary to set the Mute switch to off and the Capture
> switch to on on the Line mixer control.

Ah, now it's becoming clear.  So it's "Line-in" mixer to be unmuted
if you want to record from line-in, right?
And "Line-in Playback Volume" plays no role for recording?


Takashi