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

[Håvard]

It seems (as you mentioned before) that the mic volume is not decided by
the "Mic" bar (it's only for loopback sound), but as you can see in the
picture, even when the "Mic boost" is set to zero the "base" is still way
off.

Den fre. 5. okt. 2018 kl. 12:10 skrev Håvard <hovardslill at gmail.com>:

>
> 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
>>
>