diff --git a/Documentation/sound/alsa/HD-Audio-Models.txt b/Documentation/sound/alsa/HD-Audio-Models.txt
index 64eb1100eec1d1aca87a5adb155c550eb365c97d..0f5d26bea80f882ef471c858d0cc0277f4051671 100644
--- a/Documentation/sound/alsa/HD-Audio-Models.txt
+++ b/Documentation/sound/alsa/HD-Audio-Models.txt
@@ -349,6 +349,7 @@ STAC92HD73*
 STAC92HD83*
 ===========
   ref		Reference board
+  mic-ref	Reference board with power managment for ports
 
 STAC9872
 ========
diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index c553fdb2b149d9184e3f6e7a1fff3124317ad6a7..3dd4eee70b7caf8c32660688ec7febe6ad9a3ca5 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -81,6 +81,7 @@ enum {
 
 enum {
 	STAC_92HD83XXX_REF,
+	STAC_92HD83XXX_PWR_REF,
 	STAC_92HD83XXX_MODELS
 };
 
@@ -1734,10 +1735,12 @@ static unsigned int ref92hd83xxx_pin_configs[14] = {
 
 static unsigned int *stac92hd83xxx_brd_tbl[STAC_92HD83XXX_MODELS] = {
 	[STAC_92HD83XXX_REF] = ref92hd83xxx_pin_configs,
+	[STAC_92HD83XXX_PWR_REF] = ref92hd83xxx_pin_configs,
 };
 
 static const char *stac92hd83xxx_models[STAC_92HD83XXX_MODELS] = {
 	[STAC_92HD83XXX_REF] = "ref",
+	[STAC_92HD83XXX_PWR_REF] = "mic-ref",
 };
 
 static struct snd_pci_quirk stac92hd83xxx_cfg_tbl[] = {
@@ -4783,13 +4786,6 @@ static int patch_stac92hd83xxx(struct hda_codec *codec)
 		AC_VERB_SET_CONNECT_SEL, num_dacs);
 
 	spec->init = stac92hd83xxx_core_init;
-	switch (codec->vendor_id) {
-	case 0x111d7605:
-		break;
-	default:
-		spec->num_pwrs--;
-	}
-
 	spec->mixer = stac92hd83xxx_mixer;
 	spec->num_pins = ARRAY_SIZE(stac92hd83xxx_pin_nids);
 	spec->num_dmuxes = ARRAY_SIZE(stac92hd83xxx_dmux_nids);
@@ -4815,6 +4811,15 @@ static int patch_stac92hd83xxx(struct hda_codec *codec)
 		return err;
 	}
 
+	switch (codec->vendor_id) {
+	case 0x111d7604:
+	case 0x111d7605:
+		if (spec->board_config == STAC_92HD83XXX_PWR_REF)
+			break;
+		spec->num_pwrs = 0;
+		break;
+	}
+
 	err = stac92xx_parse_auto_config(codec, 0x1d, 0);
 	if (!err) {
 		if (spec->board_config < 0) {