diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 9218d3086f67..f210ca7575b2 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -28,6 +28,7 @@
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/module.h>
+#include <linux/sort.h>
 #include <sound/core.h>
 #include <sound/jack.h>
 #include "hda_codec.h"
@@ -90,6 +91,13 @@ struct alc_multi_io {
 #define ALC_FIXUP_ACT_INIT	HDA_FIXUP_ACT_INIT
 #define ALC_FIXUP_ACT_BUILD	HDA_FIXUP_ACT_BUILD
 
+#define MAX_AUTO_MIC_PINS	3
+
+struct alc_automic_entry {
+	hda_nid_t pin;		/* pin */
+	int idx;		/* imux index, -1 = invalid */
+	unsigned int attr;	/* pin attribute (INPUT_PIN_ATTR_*) */
+};
 
 #define MAX_NID_PATH_DEPTH	5
 
@@ -159,9 +167,6 @@ struct alc_spec {
 	/* capture source */
 	struct hda_input_mux input_mux;
 	unsigned int cur_mux[3];
-	hda_nid_t ext_mic_pin;
-	hda_nid_t dock_mic_pin;
-	hda_nid_t int_mic_pin;
 
 	/* channel model */
 	const struct hda_channel_mode *channel_mode;
@@ -179,7 +184,6 @@ struct alc_spec {
 	hda_nid_t private_dac_nids[AUTO_CFG_MAX_OUTS];
 	hda_nid_t imux_pins[HDA_MAX_NUM_INPUTS];
 	unsigned int dyn_adc_idx[HDA_MAX_NUM_INPUTS];
-	int int_mic_idx, ext_mic_idx, dock_mic_idx; /* for auto-mic */
 	hda_nid_t inv_dmic_pin;
 	hda_nid_t shared_mic_vref_pin;
 
@@ -190,6 +194,10 @@ struct alc_spec {
 	/* path list */
 	struct snd_array paths;
 
+	/* auto-mic stuff */
+	int am_num_entries;
+	struct alc_automic_entry am_entry[MAX_AUTO_MIC_PINS];
+
 	/* hooks */
 	void (*init_hook)(struct hda_codec *codec);
 #ifdef CONFIG_PM
@@ -210,6 +218,7 @@ struct alc_spec {
 	unsigned int automute_speaker_possible:1; /* there are speakers and either LO or HP */
 	unsigned int automute_lo_possible:1;	  /* there are line outs and HP */
 	unsigned int keep_vref_in_automute:1; /* Don't clear VREF in automute */
+	unsigned int line_in_auto_switch:1; /* allow line-in auto switch */
 
 	/* other flags */
 	unsigned int need_dac_fix:1; /* need to limit DACs for multi channels */
@@ -608,20 +617,18 @@ static void alc_line_automute(struct hda_codec *codec, struct hda_jack_tbl *jack
 static void alc_mic_automute(struct hda_codec *codec, struct hda_jack_tbl *jack)
 {
 	struct alc_spec *spec = codec->spec;
-	hda_nid_t *pins = spec->imux_pins;
+	int i;
 
 	if (!spec->auto_mic)
 		return;
-	if (snd_BUG_ON(spec->int_mic_idx < 0 || spec->ext_mic_idx < 0))
-		return;
 
-	if (snd_hda_jack_detect(codec, pins[spec->ext_mic_idx]))
-		alc_mux_select(codec, 0, spec->ext_mic_idx, false);
-	else if (spec->dock_mic_idx >= 0 &&
-		   snd_hda_jack_detect(codec, pins[spec->dock_mic_idx]))
-		alc_mux_select(codec, 0, spec->dock_mic_idx, false);
-	else
-		alc_mux_select(codec, 0, spec->int_mic_idx, false);
+	for (i = spec->am_num_entries - 1; i > 0; i--) {
+		if (snd_hda_jack_detect(codec, spec->am_entry[i].pin)) {
+			alc_mux_select(codec, 0, spec->am_entry[i].idx, false);
+			return;
+		}
+	}
+	alc_mux_select(codec, 0, spec->am_entry[0].idx, false);
 }
 
 /* update the master volume per volume-knob's unsol event */
@@ -970,26 +977,33 @@ static bool alc_auto_mic_check_imux(struct hda_codec *codec)
 {
 	struct alc_spec *spec = codec->spec;
 	const struct hda_input_mux *imux;
+	int i;
 
 	imux = &spec->input_mux;
-	spec->ext_mic_idx = find_idx_in_nid_list(spec->ext_mic_pin,
-					spec->imux_pins, imux->num_items);
-	spec->int_mic_idx = find_idx_in_nid_list(spec->int_mic_pin,
-					spec->imux_pins, imux->num_items);
-	spec->dock_mic_idx = find_idx_in_nid_list(spec->dock_mic_pin,
-					spec->imux_pins, imux->num_items);
-	if (spec->ext_mic_idx < 0 || spec->int_mic_idx < 0)
-		return false; /* no corresponding imux */
+	for (i = 0; i < spec->am_num_entries; i++) {
+		spec->am_entry[i].idx =
+			find_idx_in_nid_list(spec->am_entry[i].pin,
+					     spec->imux_pins, imux->num_items);
+		if (spec->am_entry[i].idx < 0)
+			return false; /* no corresponding imux */
+	}
 
-	snd_hda_jack_detect_enable_callback(codec, spec->ext_mic_pin,
-					    ALC_MIC_EVENT, alc_mic_automute);
-	if (spec->dock_mic_pin)
-		snd_hda_jack_detect_enable_callback(codec, spec->dock_mic_pin,
+	/* we don't need the jack detection for the first pin */
+	for (i = 1; i < spec->am_num_entries; i++)
+		snd_hda_jack_detect_enable_callback(codec,
+						    spec->am_entry[i].pin,
 						    ALC_MIC_EVENT,
 						    alc_mic_automute);
 	return true;
 }
 
+static int compare_attr(const void *ap, const void *bp)
+{
+	const struct alc_automic_entry *a = ap;
+	const struct alc_automic_entry *b = bp;
+	return (int)(a->attr - b->attr);
+}
+
 /*
  * Check the availability of auto-mic switch;
  * Set up if really supported
@@ -998,66 +1012,63 @@ static int alc_init_auto_mic(struct hda_codec *codec)
 {
 	struct alc_spec *spec = codec->spec;
 	struct auto_pin_cfg *cfg = &spec->autocfg;
-	hda_nid_t fixed, ext, dock;
-	int i;
+	unsigned int types;
+	int i, num_pins;
 
-	spec->ext_mic_idx = spec->int_mic_idx = spec->dock_mic_idx = -1;
-
-	fixed = ext = dock = 0;
+	types = 0;
+	num_pins = 0;
 	for (i = 0; i < cfg->num_inputs; i++) {
 		hda_nid_t nid = cfg->inputs[i].pin;
-		unsigned int defcfg;
-		defcfg = snd_hda_codec_get_pincfg(codec, nid);
-		switch (snd_hda_get_input_pin_attr(defcfg)) {
+		unsigned int attr;
+		attr = snd_hda_codec_get_pincfg(codec, nid);
+		attr = snd_hda_get_input_pin_attr(attr);
+		if (types & (1 << attr))
+			return 0; /* already occupied */
+		switch (attr) {
 		case INPUT_PIN_ATTR_INT:
-			if (fixed)
-				return 0; /* already occupied */
 			if (cfg->inputs[i].type != AUTO_PIN_MIC)
 				return 0; /* invalid type */
-			fixed = nid;
 			break;
 		case INPUT_PIN_ATTR_UNUSED:
 			return 0; /* invalid entry */
-		case INPUT_PIN_ATTR_DOCK:
-			if (dock)
-				return 0; /* already occupied */
+		default:
 			if (cfg->inputs[i].type > AUTO_PIN_LINE_IN)
 				return 0; /* invalid type */
-			dock = nid;
-			break;
-		default:
-			if (ext)
-				return 0; /* already occupied */
-			if (cfg->inputs[i].type != AUTO_PIN_MIC)
-				return 0; /* invalid type */
-			ext = nid;
+			if (!spec->line_in_auto_switch &&
+			    cfg->inputs[i].type != AUTO_PIN_MIC)
+				return 0; /* only mic is allowed */
+			if (!is_jack_detectable(codec, nid))
+				return 0; /* no unsol support */
 			break;
 		}
+		if (num_pins >= MAX_AUTO_MIC_PINS)
+			return 0;
+		types |= (1 << attr);
+		spec->am_entry[num_pins].pin = nid;
+		spec->am_entry[num_pins].attr = attr;
+		num_pins++;
 	}
-	if (!ext && dock) {
-		ext = dock;
-		dock = 0;
-	}
-	if (!ext || !fixed)
-		return 0;
-	if (!is_jack_detectable(codec, ext))
-		return 0; /* no unsol support */
-	if (dock && !is_jack_detectable(codec, dock))
-		return 0; /* no unsol support */
 
-	/* check imux indices */
-	spec->ext_mic_pin = ext;
-	spec->int_mic_pin = fixed;
-	spec->dock_mic_pin = dock;
+	if (num_pins < 2)
+		return 0;
+
+	spec->am_num_entries = num_pins;
+	/* sort the am_entry in the order of attr so that the pin with a
+	 * higher attr will be selected when the jack is plugged.
+	 */
+	sort(spec->am_entry, num_pins, sizeof(spec->am_entry[0]),
+	     compare_attr, NULL);
 
 	if (!alc_auto_mic_check_imux(codec))
 		return 0;
 
 	spec->auto_mic = 1;
 	spec->num_adc_nids = 1;
-	spec->cur_mux[0] = spec->int_mic_idx;
+	spec->cur_mux[0] = spec->am_entry[0].idx;
 	snd_printdd("realtek: Enable auto-mic switch on NID 0x%x/0x%x/0x%x\n",
-		    ext, fixed, dock);
+		    spec->am_entry[0].pin,
+		    spec->am_entry[1].pin,
+		    spec->am_entry[2].pin);
 
 	return 0;
 }
@@ -6199,8 +6210,10 @@ static void alc271_hp_gate_mic_jack(struct hda_codec *codec,
 {
 	struct alc_spec *spec = codec->spec;
 
+	if (snd_BUG_ON(!spec->am_entry[1].pin || !spec->autocfg.hp_pins[0]))
+		return;
 	if (action == ALC_FIXUP_ACT_PROBE)
-		snd_hda_jack_set_gating_jack(codec, spec->ext_mic_pin,
+		snd_hda_jack_set_gating_jack(codec, spec->am_entry[1].pin,
 					     spec->autocfg.hp_pins[0]);
 }