[PATCH] ALSA: hda/realtek: Fix internal mic on Minisforum V3 and V3 SE

[Jared Wuerzburger <jwuerz@gmail.com>]

On the Minisforum V3 and V3 SE (ALC245, PCI SSID 1f4c:e001) the
internal digital microphone array never produces any audio. The DMIC
pin 0x12 is parsed correctly ("Internal Mic=0x12"), but the headset mic
jack pin 0x19 (BIOS pin config 0x04a19050, jack detect enabled) has no
presence detect wired on these boards: reading GET_PIN_SENSE on 0x19
always returns "present" (as it does on the unused, unconnected pin
0x18), while the headphone jack 0x21 reports correctly.

The generic parser therefore sets up auto-mic switching and, believing
an external mic is always plugged in, permanently routes the ADC to the
empty jack (mixer 0x23 input 0x19 unmuted, input 0x12 muted). The
"Mic Jack" kcontrol reports "on" with nothing plugged in.

Mark pin 0x19 as having no presence detect. The parser then stops
auto-switching and exposes a normal "Capture Source" (Internal Mic /
Mic) control, which desktop audio stacks drive from their Internal
Microphone / Microphone ports. The existing bass speaker DAC routing is
kept by chaining to ALC245_FIXUP_BASS_HP_DAC.

Tested on both models with the same pin config applied through a
snd-hda-intel patch firmware ([pincfg] 0x19 0x04a19150):
 - V3 SE (Ryzen 7 7735U, BIOS 1.03), kernel 7.2.6
 - V3 (Ryzen 7 8840U, BIOS 1.06), kernel 7.2.7
Both boards report the same codec SSID and the same 0x19 default. On
both, the internal mic records at a normal level, headphone jack
detection on 0x21 still switches output, and the bass routing is
retained (DAC1/DAC2 Playback Volume controls present). A headset mic
on the combo jack was not tested (none available); with this change it
has to be selected manually. V3 users already report that the jack mic
gets no input [1], which is the other symptom of the same broken
presence detect.

The patched alc269.c was build-tested with W=1 on tiwai/sound.git
for-linus (7.3-rc3) without new warnings.

The diagnosis, the fixup and this changelog were written with the help
of an AI coding assistant; I reviewed them and tested the change on the
hardware listed above.

Link: https://github.com/mudkipme/awesome-minisforum-v3/issues/14 [1]
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Jared Wuerzburger <jwuerz@gmail.com>
---
 sound/hda/codecs/realtek/alc269.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/sound/hda/codecs/realtek/alc269.c b/sound/hda/codecs/realtek/alc269.c
index 5127a111c..2de91431f 100644
--- a/sound/hda/codecs/realtek/alc269.c
+++ b/sound/hda/codecs/realtek/alc269.c
@@ -4384,6 +4384,7 @@ enum {
 	ALC287_FIXUP_YOGA9_14IAP7_BASS_SPK_PIN_HEADSET,
 	ALC285_LENOVO_DAC_RENAME,
 	ALC287_FIXUP_YOGA9_SPEAKER2_TO_DAC1,
+	ALC245_FIXUP_MINISFORUM_V3_MIC_NO_PRESENCE,
 };
 
 /* A special fixup for Lenovo C940 and Yoga Duet 7;
@@ -7136,6 +7137,15 @@ static const struct hda_fixup alc269_fixups[] = {
 		.chained = true,
 		.chain_id = ALC287_FIXUP_TXNW2781_I2C,
 	},
+	[ALC245_FIXUP_MINISFORUM_V3_MIC_NO_PRESENCE] = {
+		.type = HDA_FIXUP_PINS,
+		.v.pins = (const struct hda_pintbl[]) {
+			{ 0x19, 0x04a19150 }, /* headset mic jack, no presence detect */
+			{ }
+		},
+		.chained = true,
+		.chain_id = ALC245_FIXUP_BASS_HP_DAC
+	},
 };
 
 static const struct hda_quirk alc269_fixup_tbl[] = {
@@ -8349,7 +8359,8 @@ static const struct hda_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x1ee7, 0x2081, "HONOR MRB-XXX M1020", ALC256_FIXUP_HONOR_MRB_XXX_M1020_AUDIO),
 	SND_PCI_QUIRK(0x1f4c, 0xb020, "Minisforum AI X1 Pro",
 		      ALC245_FIXUP_MINISFORUM_JACK_DETECT),
-	SND_PCI_QUIRK(0x1f4c, 0xe001, "Minisforum V3 (SE)", ALC245_FIXUP_BASS_HP_DAC),
+	SND_PCI_QUIRK(0x1f4c, 0xe001, "Minisforum V3 (SE)",
+		      ALC245_FIXUP_MINISFORUM_V3_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1f66, 0x0105, "Ayaneo Portable Game Player", ALC287_FIXUP_CS35L41_I2C_2),
 	SND_PCI_QUIRK(0x2014, 0x800a, "Positivo ARN50", ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
 	SND_PCI_QUIRK(0x2039, 0x0001, "Inspur S14-G1", ALC295_FIXUP_CHROME_BOOK),
@@ -8579,6 +8590,7 @@ static const struct hda_model_fixup alc269_fixup_models[] = {
 	{.id = ALC236_FIXUP_LENOVO_INV_DMIC, .name = "alc236-fixup-lenovo-inv-mic"},
 	{.id = ALC2XX_FIXUP_HEADSET_MIC, .name = "alc2xx-fixup-headset-mic"},
 	{.id = ALC245_FIXUP_BASS_HP_DAC, .name = "alc245-fixup-bass-hp-dac"},
+	{.id = ALC245_FIXUP_MINISFORUM_V3_MIC_NO_PRESENCE, .name = "alc245-minisforum-v3-mic"},
 	{.id = ALC256_FIXUP_HONOR_MRB_XXX_M1020_AUDIO, .name = "alc256-honor-mrb-xxx-m1020-audio"},
 	{.id = ALC287_FIXUP_LENOVO_LEGION_AW88399, .name = "alc287-lenovo-legion-aw88399"},
 	{}
-- 
2.55.0