Re: [PATCH 1/2] ALSA: hda/realtek: Fix headset mic on Acer Nitro 5

[Hridesh MG <hridesh699@xxxxxxxxx>]

> Is alc_fixup_headset_mode() called by the quirk chain?
> When this is set up via quirks, alc_update_headset_mode() gets called
> at initialization and this should detect the headset type.  At that
> point, alc_headset_mode_ctia() would be called if the proper type gets
> detected.

Thanks for pointing me in the right direction, I believe I've managed
to find the root problem. I've set it up via quirks to call
alc_update_headset_mode(), when I plug in any earphone,
alc_determine_headset_type() incorrectly determines that the type is
OMTP despite it being CTIA (I've confirmed this on a friend's laptop).
Adding my codec to a case in alc_determine_headset_type() for my codec
seems to fix this issue.
After the headset is detected as CTIA, I also had to add my codec to a
case in alc_headset_mode_ctia() to set the process coefficient to
0xD689 (as written in my original patch) to finally pick up the mic
input.

I hope this is a satisfactory approach, if it is not, please let me
know. I'll make an attempt to understand the cases and process
coefficients before sending v2.