diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 70c569459758..a0c290cef763 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -64,11 +64,14 @@ enum {
 
 enum {
 	STAC_92HD73XX_REF,
+	STAC_DELL_M6,
 	STAC_92HD73XX_MODELS
 };
 
 enum {
 	STAC_92HD71BXX_REF,
+	STAC_DELL_M4_1,
+	STAC_DELL_M4_2,
 	STAC_92HD71BXX_MODELS
 };
 
@@ -334,10 +337,10 @@ static hda_nid_t stac922x_pin_nids[10] = {
 	0x0f, 0x10, 0x11, 0x15, 0x1b,
 };
 
-static hda_nid_t stac92hd73xx_pin_nids[12] = {
+static hda_nid_t stac92hd73xx_pin_nids[13] = {
 	0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
 	0x0f, 0x10, 0x11, 0x12, 0x13,
-	0x14, 0x22
+	0x14, 0x1e, 0x22
 };
 
 static hda_nid_t stac92hd71bxx_pin_nids[10] = {
@@ -1220,24 +1223,48 @@ static struct snd_pci_quirk stac925x_cfg_tbl[] = {
 	{} /* terminator */
 };
 
-static unsigned int ref92hd73xx_pin_configs[12] = {
+static unsigned int ref92hd73xx_pin_configs[13] = {
 	0x02214030, 0x02a19040, 0x01a19020, 0x02214030,
 	0x0181302e, 0x01014010, 0x01014020, 0x01014030,
 	0x02319040, 0x90a000f0, 0x90a000f0, 0x01452050,
+	0x01452050,
+};
+
+static unsigned int dell_m6_pin_configs[13] = {
+	0x0321101f, 0x4f00000f, 0x4f0000f0, 0x90170110,
+	0x03a11020, 0x03011050, 0x4f0000f0, 0x4f0000f0,
+	0x4f0000f0, 0x90a60160, 0x4f0000f0, 0x4f0000f0,
+	0x4f0000f0,
 };
 
 static unsigned int *stac92hd73xx_brd_tbl[STAC_92HD73XX_MODELS] = {
-	[STAC_92HD73XX_REF] = ref92hd73xx_pin_configs,
+	[STAC_92HD73XX_REF]	= ref92hd73xx_pin_configs,
+	[STAC_DELL_M6]	= dell_m6_pin_configs,
 };
 
 static const char *stac92hd73xx_models[STAC_92HD73XX_MODELS] = {
 	[STAC_92HD73XX_REF] = "ref",
+	[STAC_DELL_M6] = "dell-m6",
 };
 
 static struct snd_pci_quirk stac92hd73xx_cfg_tbl[] = {
 	/* SigmaTel reference board */
 	SND_PCI_QUIRK(PCI_VENDOR_ID_INTEL, 0x2668,
-		      "DFI LanParty", STAC_92HD73XX_REF),
+				"DFI LanParty", STAC_92HD73XX_REF),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0254,
+				"unknown Dell", STAC_DELL_M6),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0255,
+				"unknown Dell", STAC_DELL_M6),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0256,
+				"unknown Dell", STAC_DELL_M6),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0257,
+				"unknown Dell", STAC_DELL_M6),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x025e,
+				"unknown Dell", STAC_DELL_M6),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x025f,
+				"unknown Dell", STAC_DELL_M6),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0271,
+				"unknown Dell", STAC_DELL_M6),
 	{} /* terminator */
 };
 
@@ -1247,18 +1274,56 @@ static unsigned int ref92hd71bxx_pin_configs[10] = {
 	0x90a000f0, 0x01452050,
 };
 
+static unsigned int dell_m4_1_pin_configs[13] = {
+	0x0421101f, 0x04a11221, 0x40f000f0, 0x90170110,
+	0x23a1902e, 0x23014250, 0x40f000f0, 0x4f0000f0,
+	0x40f000f0, 0x4f0000f0,
+};
+
+static unsigned int dell_m4_2_pin_configs[13] = {
+	0x0421101f, 0x04a11221, 0x90a70330, 0x90170110,
+	0x23a1902e, 0x23014250, 0x40f000f0, 0x40f000f0,
+	0x40f000f0, 0x044413b0,
+};
+
 static unsigned int *stac92hd71bxx_brd_tbl[STAC_92HD71BXX_MODELS] = {
 	[STAC_92HD71BXX_REF] = ref92hd71bxx_pin_configs,
+	[STAC_DELL_M4_1]	= dell_m4_1_pin_configs,
+	[STAC_DELL_M4_2]	= dell_m4_2_pin_configs,
 };
 
 static const char *stac92hd71bxx_models[STAC_92HD71BXX_MODELS] = {
 	[STAC_92HD71BXX_REF] = "ref",
+	[STAC_DELL_M4_1] = "dell-m4-1",
+	[STAC_DELL_M4_2] = "dell-m4-2",
 };
 
 static struct snd_pci_quirk stac92hd71bxx_cfg_tbl[] = {
 	/* SigmaTel reference board */
 	SND_PCI_QUIRK(PCI_VENDOR_ID_INTEL, 0x2668,
 		      "DFI LanParty", STAC_92HD71BXX_REF),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0233,
+				"unknown Dell", STAC_DELL_M4_1),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0234,
+				"unknown Dell", STAC_DELL_M4_1),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0250,
+				"unknown Dell", STAC_DELL_M4_1),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x024f,
+				"unknown Dell", STAC_DELL_M4_1),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x024d,
+				"unknown Dell", STAC_DELL_M4_1),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0251,
+				"unknown Dell", STAC_DELL_M4_1),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0277,
+				"unknown Dell", STAC_DELL_M4_1),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0263,
+				"unknown Dell", STAC_DELL_M4_2),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0265,
+				"unknown Dell", STAC_DELL_M4_2),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0262,
+				"unknown Dell", STAC_DELL_M4_2),
+	SND_PCI_QUIRK(PCI_VENDOR_ID_DELL, 0x0264,
+				"unknown Dell", STAC_DELL_M4_2),
 	{} /* terminator */
 };
 
@@ -3356,13 +3421,39 @@ again:
 
 	spec->num_muxes = ARRAY_SIZE(stac92hd73xx_mux_nids);
 	spec->num_adcs = ARRAY_SIZE(stac92hd73xx_adc_nids);
-	spec->num_dmics = STAC92HD73XX_NUM_DMICS;
 	spec->num_dmuxes = ARRAY_SIZE(stac92hd73xx_dmux_nids);
 	spec->dinput_mux = &stac92hd73xx_dmux;
 	/* GPIO0 High = Enable EAPD */
 	spec->gpio_mask = spec->gpio_dir = 0x1;
 	spec->gpio_data = 0x01;
 
+	switch (spec->board_config) {
+	case STAC_DELL_M6:
+		switch (codec->subsystem_id) {
+		case 0x1028025e: /* Analog Mics */
+		case 0x1028025f:
+			stac92xx_set_config_reg(codec, 0x0b, 0x90A70170);
+			spec->num_dmics = 0;
+			break;
+		case 0x10280254: /* Digital Mics */
+		case 0x10280255:
+		case 0x10280271:
+		case 0x10280272:
+			stac92xx_set_config_reg(codec, 0x13, 0x90A60160);
+			spec->num_dmics = 1;
+			break;
+		case 0x10280256: /* Both */
+		case 0x10280057:
+			stac92xx_set_config_reg(codec, 0x0b, 0x90A70170);
+			stac92xx_set_config_reg(codec, 0x13, 0x90A60160);
+			spec->num_dmics = 1;
+			break;
+		}
+		break;
+	default:
+		spec->num_dmics = STAC92HD73XX_NUM_DMICS;
+	}
+
 	spec->num_pwrs = ARRAY_SIZE(stac92hd73xx_pwr_nids);
 	spec->pwr_nids = stac92hd73xx_pwr_nids;