[PATCH 5.4 002/411] ALSA: hda/realtek - Fix microphone noise on ASUS TUF B550M-PLUS

From: Greg Kroah-Hartman
Date: Mon Jun 13 2022 - 06:52:03 EST

From: Marios Levogiannis <marios.levogiannis@xxxxxxxxx>

commit 9bfa7b36343c7d84370bc61c9ed774635b05e4eb upstream.

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

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@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220530074131.12258-1-marios.levogiannis@xxxxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
sound/pci/hda/patch_realtek.c | 10 ++++++++++
1 file changed, 10 insertions(+)

--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -1932,6 +1932,7 @@ enum {

static void alc889_fixup_coef(struct hda_codec *codec,
@@ -2477,6 +2478,14 @@ static const struct hda_fixup alc882_fix
.chained = true,
.chain_id = ALC887_FIXUP_ASUS_AUDIO,
+ .v.pins = (const struct hda_pintbl[]) {
+ { 0x18, PIN_VREF50 }, /* rear mic */
+ { 0x19, PIN_VREF50 }, /* front mic */
+ {}
+ }
+ },

static const struct snd_pci_quirk alc882_fixup_tbl[] = {
@@ -2514,6 +2523,7 @@ static const struct snd_pci_quirk alc882
SND_PCI_QUIRK(0x1043, 0x835f, "Asus Eee 1601", ALC888_FIXUP_EEE1601),
SND_PCI_QUIRK(0x1043, 0x84bc, "ASUS ET2700", ALC887_FIXUP_ASUS_BASS),
SND_PCI_QUIRK(0x1043, 0x8691, "ASUS ROG Ranger VIII", ALC882_FIXUP_GPIO3),
SND_PCI_QUIRK(0x104d, 0x9043, "Sony Vaio VGC-LN51JGB", ALC882_FIXUP_NO_PRIMARY_HP),
SND_PCI_QUIRK(0x104d, 0x9044, "Sony VAIO AiO", ALC882_FIXUP_NO_PRIMARY_HP),
SND_PCI_QUIRK(0x104d, 0x9047, "Sony Vaio TT", ALC889_FIXUP_VAIO_TT),