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

[Håvard]

Hi!

Another issue I forgot to mention, just because I thought it was an
inherent issue of the card (and it most likely is), is that when sound
levels drop and/or turn off and then up/on again a little crackle goes
through. This is also a very common problem under windows usage too, as
many have reported hearing crackling through speakers when music starts
playing. Some have got it working in windows by reinstalling drivers, but I
(and many others) didn't. It is really only notable when enabling speakers,
and/or purposefully dragging the volume bar fast up and down. It's not
really relevant to this microphone issue, but since you asked for other
problems I thought I would mention it. However if you deem it not worth the
investment (which is understandable as it is only a small issue) I could
open another thread specifically for this issue if it becomes a problem.

-Håvard

Den fre. 5. okt. 2018 kl. 12:31 skrev Håvard <hovardslill at gmail.com>:

> Thank you so much!
>
> Will this work for all G751 models, and will this be in the 4.19 kernel?
>
> I am very thankful for all your hard work!!
>
> -Håvard
>
> Den fre. 5. okt. 2018 kl. 12:29 skrev Takashi Iwai <tiwai at suse.de>:
>
>> On Fri, 05 Oct 2018 12:10:52 +0200,
>> Håvard wrote:
>> >
>> > 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
>>
>> OK, then the following patch may work.  Give it a try.
>>
>>
>> > 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
>>
>> The Mic volume is only for analog loopback, so it can be normal.
>>
>>
>> Takashi
>>
>> ---
>> --- a/sound/pci/hda/patch_realtek.c
>> +++ b/sound/pci/hda/patch_realtek.c
>> @@ -7738,6 +7738,7 @@ enum {
>>         ALC662_FIXUP_ASUS_Nx50,
>>         ALC668_FIXUP_ASUS_Nx51_HEADSET_MODE,
>>         ALC668_FIXUP_ASUS_Nx51,
>> +       ALC668_FIXUP_ASUS_G751,
>>         ALC891_FIXUP_HEADSET_MODE,
>>         ALC891_FIXUP_DELL_MIC_NO_PRESENCE,
>>         ALC662_FIXUP_ACER_VERITON,
>> @@ -8007,6 +8008,14 @@ static const struct hda_fixup alc662_fixups[] = {
>>                 .chained = true,
>>                 .chain_id = ALC668_FIXUP_ASUS_Nx51_HEADSET_MODE,
>>         },
>> +       [ALC668_FIXUP_ASUS_G751] = {
>> +               .type = HDA_FIXUP_VERBS,
>> +               .v.verbs = (const struct hda_verb[]) {
>> +                       { 0x20, AC_VERB_SET_COEF_INDEX, 0xc3 },
>> +                       { 0x20, AC_VERB_SET_PROC_COEF, 0x4000 },
>> +                       {}
>> +               },
>> +       },
>>         [ALC891_FIXUP_HEADSET_MODE] = {
>>                 .type = HDA_FIXUP_FUNC,
>>                 .v.func = alc_fixup_headset_mode,
>> @@ -8080,6 +8089,7 @@ static const struct snd_pci_quirk
>> alc662_fixup_tbl[] = {
>>         SND_PCI_QUIRK(0x1043, 0x11cd, "Asus N550",
>> ALC662_FIXUP_ASUS_Nx50),
>>         SND_PCI_QUIRK(0x1043, 0x13df, "Asus N550JX",
>> ALC662_FIXUP_BASS_1A),
>>         SND_PCI_QUIRK(0x1043, 0x129d, "Asus N750",
>> ALC662_FIXUP_ASUS_Nx50),
>> +       SND_PCI_QUIRK(0x1043, 0x12ff, "ASUS G751",
>> ALC668_FIXUP_ASUS_G751),
>>         SND_PCI_QUIRK(0x1043, 0x1477, "ASUS N56VZ",
>> ALC662_FIXUP_BASS_MODE4_CHMAP),
>>         SND_PCI_QUIRK(0x1043, 0x15a7, "ASUS UX51VZH",
>> ALC662_FIXUP_BASS_16),
>>         SND_PCI_QUIRK(0x1043, 0x177d, "ASUS N551",
>> ALC668_FIXUP_ASUS_Nx51),
>> @@ -8184,6 +8194,7 @@ static const struct hda_model_fixup
>> alc662_fixup_models[] = {
>>         {.id = ALC668_FIXUP_DELL_XPS13, .name = "dell-xps13"},
>>         {.id = ALC662_FIXUP_ASUS_Nx50, .name = "asus-nx50"},
>>         {.id = ALC668_FIXUP_ASUS_Nx51, .name = "asus-nx51"},
>> +       {.id = ALC668_FIXUP_ASUS_G751, .name = "asus-g751"},
>>         {.id = ALC891_FIXUP_HEADSET_MODE, .name = "alc891-headset"},
>>         {.id = ALC891_FIXUP_DELL_MIC_NO_PRESENCE, .name =
>> "alc891-headset-multi"},
>>         {.id = ALC662_FIXUP_ACER_VERITON, .name = "acer-veriton"},
>>
>