Re: [PATCH] ALSA: hda/realtek: Fix hiss/crackle on Lenovo Xiaoxin 14 GT (17aa:3912)

[Takashi Iwai <tiwai@suse.de>]

On Thu, 15 Oct 2026 15:21:57 +0200,
Viktor Menshin wrote:
> 
> Commit 3a3e810e9108 ("ALSA: hda/realtek: Add quirk for Lenovo Xiaoxin
> 14 GT") added a quirk mapping SSID 17aa:3912 to
> ALC287_FIXUP_YOGA9_14IAP7_BASS_SPK_PIN, chosen by analogy with
> neighboring SSIDs (0x390d, 0x3911, 0x391a) without being verified on
> hardware, as noted in that commit's own message.
> 
> I have since tested it on the actual hardware (Lenovo Xiaoxin Pro 14
> ASP10, same 17aa:3912 SSID) and confirmed it does not fix the reported
> issue. ALC287_FIXUP_YOGA9_14IAP7_BASS_SPK_PIN only repoints pin 0x17
> and the preferred DAC pairs for the bass speaker; it does not touch
> the codec's vendor processing coefficients. The actual symptom -
> constant electrical hiss/crackle on both the headphone jack and the
> internal speakers, independent of volume - is unrelated to pin/DAC
> routing and is also present on stock Windows before the Realtek
> driver is installed, which points at those coefficients being left
> at their power-on default.
> 
> To find the correct values, I passed the physical HD Audio controller
> through to a Windows 10 VM (VFIO, with QEMU patched to log CORB verb
> traffic) and captured the coefficient writes the vendor Realtek driver
> performs at init. Replaying a single one of them on Linux via hda-verb
> reproducibly eliminates the headphone jack noise:
> 
>     hda-verb /dev/snd/hwC#D0 0x20 SET_COEF_INDEX 0x36
>     hda-verb /dev/snd/hwC#D0 0x20 SET_PROC_COEF  0x77d7
> 
> This has held up across reboots and kernel updates for several weeks
> (applied via a small systemd oneshot unit while testing).
> 
> Add a dedicated fixup that performs this coefficient write and chains
> it with the existing ALC287_FIXUP_YOGA9_14IAP7_BASS_SPK_PIN (which may
> still be relevant for the bass speaker pin wiring on this board), and
> point the 17aa:3912 quirk entry at it instead.
> 
> Honesty note: this fixes the headphone jack. The internal speakers
> still have noise under certain conditions (notably worse on AC power)
> that I have not been able to isolate via coefficient-table replay;
> that part remains open. Sending what is verified to work rather than
> holding this back.
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=221203
> Fixes: 3a3e810e9108 ("ALSA: hda/realtek: Add quirk for Lenovo Xiaoxin 14 GT")
> Signed-off-by: Viktor Menshin <ripeeerr@gmail.com>

Applied to for-next branch now.  Thanks.


Takashi