[PATCH] ALSA: hda/realtek - Fix microphone noise on ASUS TUF B550M-PLUS

[Takashi Iwai]

On Mon, 30 May 2022 09:41:31 +0200,
Marios Levogiannis wrote:
> 
> Set microphone pins 0x18 (rear) and 0x19 (front) to VREF_50 to fix the
> microphone noise on ASUS TUF B550M-PLUS which uses the ALCS1200A codec.
> The initial value was VREF_80.
> 
> The same issue is also present on Windows using both the default Windows
> driver and all tested Realtek drivers before version 6.0.9049.1. Comparing
> Realtek driver 6.0.9049.1 (the first one without the microphone noise) to
> Realtek driver 6.0.9047.1 (the last one with the microphone noise)
> revealed that the fix is the result of setting pins 0x18 and 0x19 to
> VREF_50.
> 
> This fix may also work for other boards that have been reported to have
> the same microphone issue and use the ALC1150 and ALCS1200A codecs, since
> these codecs are similar and the fix in the Realtek driver on Windows is
> common for both. However, it is currently enabled only for ASUS TUF
> B550M-PLUS as this is the only board that could be tested.
> 
> Signed-off-by: Marios Levogiannis <marios.levogiannis at gmail.com>

Thanks, applied now.


Takashi