[alsa-devel] [PATCH] ALSA: hda - Limit internal mic boost for a few Asus machines

[David Henningsson]

These are being reported as being so noisy at high mic boost levels,
so they are unusable in practice.
Therefore artificially limit the boosts.

BugLink: https://bugs.launchpad.net/bugs/1089795
Signed-off-by: David Henningsson <david.henningsson at canonical.com>
---
 sound/pci/hda/patch_realtek.c |   42 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 28b3f5a..6e5d383 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -3156,6 +3156,38 @@ static void alc271_hp_gate_mic_jack(struct hda_codec *codec,
 	}
 }
 
+static void alc269_fixup_limit_int_mic_boost(struct hda_codec *codec,
+					     const struct hda_fixup *fix,
+					     int action)
+{
+	struct alc_spec *spec = codec->spec;
+	struct auto_pin_cfg *cfg = &spec->gen.autocfg;
+	int i;
+
+	/* The mic boosts on level 2 and 3 are too noisy
+	   on the internal mic input.
+	   Therefore limit the boost to 0 or 1. */
+
+	if (action != HDA_FIXUP_ACT_PROBE)
+		return;
+
+	for (i = 0; i < cfg->num_inputs; i++) {
+		hda_nid_t nid = cfg->inputs[i].pin;
+		unsigned int defcfg;
+		if (cfg->inputs[i].type != AUTO_PIN_MIC)
+			continue;
+		defcfg = snd_hda_codec_get_pincfg(codec, nid);
+		if (snd_hda_get_input_pin_attr(defcfg) != INPUT_PIN_ATTR_INT)
+			continue;
+
+		snd_hda_override_amp_caps(codec, nid, HDA_INPUT,
+					  (0x00 << AC_AMPCAP_OFFSET_SHIFT) |
+					  (0x01 << AC_AMPCAP_NUM_STEPS_SHIFT) |
+					  (0x2f << AC_AMPCAP_STEP_SIZE_SHIFT) |
+					  (0 << AC_AMPCAP_MUTE_SHIFT));
+	}
+}
+
 enum {
 	ALC269_FIXUP_SONY_VAIO,
 	ALC275_FIXUP_SONY_VAIO_GPIO2,
@@ -3190,6 +3222,7 @@ enum {
 	ALC271_FIXUP_AMIC_MIC2,
 	ALC271_FIXUP_HP_GATE_MIC_JACK,
 	ALC269_FIXUP_ACER_AC700,
+	ALC269_FIXUP_LIMIT_INT_MIC_BOOST,
 };
 
 static const struct hda_fixup alc269_fixups[] = {
@@ -3428,6 +3461,10 @@ static const struct hda_fixup alc269_fixups[] = {
 		.chained = true,
 		.chain_id = ALC271_FIXUP_DMIC,
 	},
+	[ALC269_FIXUP_LIMIT_INT_MIC_BOOST] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc269_fixup_limit_int_mic_boost,
+	},
 };
 
 static const struct snd_pci_quirk alc269_fixup_tbl[] = {
@@ -3458,11 +3495,14 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x103c, 0x1973, "HP Pavilion", ALC269_FIXUP_HP_MUTE_LED_MIC1),
 	SND_PCI_QUIRK(0x103c, 0x1983, "HP Pavilion", ALC269_FIXUP_HP_MUTE_LED_MIC1),
 	SND_PCI_QUIRK_VENDOR(0x103c, "HP", ALC269_FIXUP_HP_MUTE_LED),
+	SND_PCI_QUIRK(0x1043, 0x106d, "Asus K53BE", ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
+	SND_PCI_QUIRK(0x1043, 0x115d, "Asus 1015E", ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
 	SND_PCI_QUIRK(0x1043, 0x1427, "Asus Zenbook UX31E", ALC269VB_FIXUP_DMIC),
 	SND_PCI_QUIRK(0x1043, 0x1517, "Asus Zenbook UX31A", ALC269VB_FIXUP_DMIC),
+	SND_PCI_QUIRK(0x1043, 0x16e3, "ASUS UX50", ALC269_FIXUP_STEREO_DMIC),
 	SND_PCI_QUIRK(0x1043, 0x1a13, "Asus G73Jw", ALC269_FIXUP_ASUS_G73JW),
 	SND_PCI_QUIRK(0x1043, 0x1b13, "Asus U41SV", ALC269_FIXUP_INV_DMIC),
-	SND_PCI_QUIRK(0x1043, 0x16e3, "ASUS UX50", ALC269_FIXUP_STEREO_DMIC),
+	SND_PCI_QUIRK(0x1043, 0x1c23, "Asus X55U", ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
 	SND_PCI_QUIRK(0x1043, 0x831a, "ASUS P901", ALC269_FIXUP_STEREO_DMIC),
 	SND_PCI_QUIRK(0x1043, 0x834a, "ASUS S101", ALC269_FIXUP_STEREO_DMIC),
 	SND_PCI_QUIRK(0x1043, 0x8398, "ASUS P1005", ALC269_FIXUP_STEREO_DMIC),
-- 
1.7.9.5