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

[Håvard]

I'll try to answer your previous email first.

Everything seems identical to how it was in the 4.18-gentoo kernel when not
setting the model=alc668-headset option

And using the trick we found:

./hda-verb /dev/snd/hwC0D0 0x20 0x500 0xc3
./hda-verb /dev/snd/hwC0D0 0x20 0x440 0x00

Made it so loopback worked perfectly fine for both earpieces.

One curiosity however (this is just a small thing) is that the "base" mic
level is far lower than when the "Mic" option in alsamixer is set to 100. I
don't know if it was this way in 4.18-gentoo, but that's the only thing
that doesnt seem correct.
Here is a screenshot explaining it:
http://i.imgur.com/dKPELX6.png

-Håvard

Den fre. 5. okt. 2018 kl. 12:03 skrev Takashi Iwai <tiwai at suse.de>:

> On Fri, 05 Oct 2018 12:00:30 +0200,
> Håvard wrote:
> >
> > And curiously, turning on loopback only made it so the right ear could
> hear
> > the output, while plain noise came from the left earpiece.
>
> Maybe it's a mono mic-in.
>
> When you record from the mic-in, do you get the signals from both left
> and right channels?  Or it's also right-only?
>
>
> Takashi
>