Re: [PATCH] ALSA: hda/realtek: Fix internal mic capture on ASUS ROG Flow Z13 GZ302EA

[Takashi Iwai <tiwai@suse.de>]

On Fri, 09 Oct 2026 23:19:39 +0200,
Alex James wrote:
> 
> The ASUS ROG Flow Z13 GZ302EA (Realtek ALC294, SSID 1043:1fb3) exposes
> two fixed internal mic pins, 0x12 (0x90a60140) and 0x13 (0x90a60130), as
> capture sources "Internal Mic" and "Internal Mic 1". The input mux
> defaults to 0x12, but on this model 0x12 is defective: its right channel
> rails to -32768 and the left channel carries heavy noise, so out of the
> box the internal microphone records loud noise/hum.
> Pin 0x13 captures clean audio on both channels (at lower level). The
> mic array is not reachable through the AMD ACP70/PDM path either: forcing
> it on via ACPI _WOV=1 creates the dmic-codec device but all samples rail
> at -32768, so HDA is the only usable capture path.
> The existing quirk for this SSID only initializes the two CS35L41 I2C
> smart amps (speakers). Disable the broken 0x12 pin via pincfg so that
> 0x13 becomes the sole "Internal Mic" capture source, and keep the CS35L41
> initialization by chaining it in a new fixup.
> Measured on a GZ302EA (arecord, 48 kHz S16LE, identical gain):
>   pin 0x12: L 47% clipped samples, R 15% clipped (railed noise)
>   pin 0x13: <0.3% clipped, hum components below -65 dBFS
> The fix was validated on the target hardware without building a kernel
> by applying the same pincfg override (0x12 -> 0x40000000) through a
> boot-time HDA patch firmware (snd-hda-intel patch=). With the override
> the codec parser drops pin 0x12 entirely: the card comes up with a single
> "Internal Mic" (0x13), the Capture Source mux control disappears (single
> input is hardwired), and capture is clean and stable across boot,
> suspend/resume, and PipeWire/WirePlumber route re-applies. Note that a
> runtime hda-verb override alone is not sufficient because the bus driver
> builds its pin cache at codec registration.
> Also observed on this SSID while testing: repeated
> "ALC294: Invalid fixup type 2016568172" messages in dmesg during probe
> with the current quirk; likely unrelated but worth a look.
> Link: https://github.com/CachyOS/linux-cachyos/issues/880
> Tested-by: aic0d3r <funforfreeapps@gmail.com>
> Signed-off-by: aic0d3r <funforfreeapps@gmail.com>

The blank lines and the white spaces seem broken, possibly due to your
mailer, so the patch can't be applied correctly.  Also, the
Signed-off-by tag has to be a real name (or a known identity) as it's
a legal requirement.  Yet better would be to align From tag with
Signed-off-by, too.

Could you resubmit with proper blank lines and keeping the tabs/spaces
as well as Signed-off-by/From tag corrections?


thanks,

Takashi