[alsa-devel] No sound with Sony VAIO VPCZ1 (ALC889)

[Takashi Iwai]

At Mon, 08 Jul 2013 09:35:10 -0700,
Adam Williamson wrote:
> 
> On 2013-07-07 16:09, Tormen wrote:
> > On 05/07/13 23:38, Adam Williamson wrote:
> >> On 2013-07-05 5:29, Takashi Iwai wrote:
> >> 
> >>>> This is the debian 3.9.6 kernel + alsa-compile to get "debug=2" for
> >>>> snd.ko module to work as by default the CONFIG_SND_DEBUG is not set 
> >>>> in
> >>>> debian kernels.
> >>> 
> >>> OK, looking at two outputs, the difference is that the recent kernel
> >>> allows the 5.1 output configuration with two mic jacks.  But, this
> >>> looks rather strange as a laptop.  Does the machine have really two
> >>> microphone jacks?  The BIOS sets pins 0x18 and 0x19 are mic jacks.
> >> 
> >> I feel like this was the issue the LAST time it stopped working, too.
> >> No, the system does not have two mic jacks - at least, there is only
> >> one visible and accessible to the user on the outside of the case, on
> >> my model.
> > Actually... there should be three mic channels:
> >     The built-in (internal) microphone
> >     +
> >     One mic jack beside the headphone jack
> >     +
> >     One other hidden within the headphone jack:
> >     (a) the Notebook came with Noise-cancelling headsets, but they are
> > small in-ear plugs so there is no place for noise-cancelling logic in
> > the plugs
> >     (b) I think I remember to have read somewhere that this thingy
> > actually needs the windows driver installed to be noise-cancelling!
> >     (c) the PLUG of these headphones have another channel (visible
> > through another ring on the jack)
> > 
> > This explains the 2nd mic channel :)
> 
> Ah, yes, I'd forgotten about that little wrinkle. I don't pretend to be 
> following the exact details of the planned fix here, but just as a 
> high-level remark, this 'extra mic jack' seems very much like an 
> implementation detail for the noise cancellation which Linux does not do 
> in any case (AFAIK). It wouldn't make sense to me to expose it as a 
> 'normal' mic jack, exactly. It's not like you can plug an actual 
> microphone into this 'mic jack' and use it. How will it be exposed 
> exactly after the patch, tiwai?

Well, Tormen's description sounds like it being a mic for a headset,
no?  If so, it's not for a noise canceling, and we can expose the jack
and the control of the secondary mic simply as "Headset Mic".
In anyway, this will be a separate fix.


Takashi