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

[Håvard]

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.

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

-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
>