[alsa-devel] Microphone detected, but no output for all ASUS G751xx with ALC668 chipset

[Takashi Iwai]

On Tue, 11 Sep 2018 18:40:23 +0200,
Håvard wrote:
> 
> Thank you for replying!
> 
> Enabling loopback in alsamixer:
> http://i.imgur.com/lNo6e7T.png
> 
> And unmuting more and more things in "Mic Playback Volume" in hdaanalyzer:
> http://i.imgur.com/H0HiOhy.png
> made white noise come from the headset. However it did not change or react
> at all when I talked or even muted the microphone physically.
> 
> I couldn't find "Mic Playback Switch" anywhere in either alsamixer or
> hdaanalyzer.

It's a mixer mute switch.

> The microphone works perfectly fine under Windows, so I don't think it is
> the mic pin.

But the fact above indicates the possibility of the wrong pin, too.

Does the jack detection of the ext mic pin work?


Takashi

> 
> -Håvard
> 
> Den man. 10. sep. 2018 kl. 22:39 skrev Takashi Iwai <tiwai at suse.de>:
> 
> > On Thu, 06 Sep 2018 20:44:30 +0200,
> > Håvard wrote:
> > >
> > > Additional relevant info:
> > >
> > > A similar issue was also discussed three years ago on Sun Jun 17:15:54
> > CEST
> > > 2015 and was about his surround sound setup, but did not touch on the
> > > external microphone problem:
> > >
> > http://mailman.alsa-project.org/pipermail/alsa-devel/2015-June/093317.html
> > >
> > > alsa-info.sh:
> > >
> > http://www.alsa-project.org/db/?f=1d8616ba5977308e03db6c3a86e36e9e9b38d6f0
> > >
> > > Graph of ALC668 chipset from hdaanalyzer:
> > > http://i.imgur.com/c08DNJW.png
> > >
> > > setting alsa-mode[1-8] does nothing to help the issue.
> > >
> > > There are several of similar bug reports around the web experiencing
> > > similar issues, and on different distros.
> > >
> > > Microphone works perfectly in windows
> > >
> > > I have a ASUS ROG G751JT, but this problem seems to happen with all
> > laptops
> > > under the G751 name.
> >
> > When you enable the loopback volume and switch, and unmute/adjust "Mic
> > Playback Volume", and "Mic Playback Switch", do you hear the input
> > from the ext mic?  It's a route directly from NID 0x18 to the mixer
> > NID 0x0b, then output mixer NID 0x0c, then outputs.  So this can be
> > used to verify the hardware routing.
> >
> > If you don't hear via this route, it means that the input from the ext
> > mic pin itself is broken, and it implies that something outside
> > HD-audio codec.
> >
> >
> > Takashi
> >
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