--- acpi_ibm.c.orig	2018-06-16 21:04:26.450103000 +0200
+++ acpi_ibm.c	2018-06-17 21:59:11.690305000 +0200
@@ -74,6 +74,7 @@
 #define ACPI_IBM_METHOD_FANSTATUS	12
 #define ACPI_IBM_METHOD_THERMAL		13
 #define ACPI_IBM_METHOD_HANDLEREVENTS	14
+#define ACPI_IBM_METHOD_MIC_LED		15
 
 /* Hotkeys/Buttons */
 #define IBM_RTC_HOTKEY1			0x64
@@ -175,6 +176,10 @@
 	int		led_busy;
 	int		led_state;
 
+	/* Mic led handle */
+	ACPI_HANDLE	mic_led_handle;
+	int		mic_led_state;
+
 	int		wlan_bt_flags;
 	int		thermal_updt_supported;
 
@@ -258,7 +263,11 @@
 		.method		= ACPI_IBM_METHOD_FANSTATUS,
 		.description	= "Fan enable",
 	},
-
+	{
+		.name		= "mic_led",
+		.method		= ACPI_IBM_METHOD_MIC_LED,
+		.description	= "Mic led",
+	},
 	{ NULL, 0, NULL, 0 }
 };
 
@@ -371,6 +380,35 @@
 }
 
 static int
+acpi_ibm_mic_led_set (struct acpi_ibm_softc *sc, int arg)
+{
+	ACPI_OBJECT_LIST input;
+	ACPI_OBJECT params[1];
+	ACPI_STATUS status;
+
+	if (arg < 0 || arg > 1)
+		return (EINVAL);
+
+	if (sc->mic_led_handle) {
+		params[0].Type = ACPI_TYPE_INTEGER;
+		params[0].Integer.Value = 0;
+		/* mic led: 0 off, 2 on */
+		if (arg == 1)
+			params[0].Integer.Value = 2;
+
+		input.Pointer = params;
+		input.Count = 1;
+
+		status = AcpiEvaluateObject (sc->handle, "MMTS", &input, NULL);
+		if (ACPI_SUCCESS(status))
+			sc->mic_led_state = arg;
+		return(status);
+	}
+
+	return (0);
+}
+
+static int
 acpi_ibm_probe(device_t dev)
 {
 	if (acpi_disabled("ibm") ||
@@ -552,6 +590,9 @@
 	}
 	ACPI_SERIAL_END(ibm);
 
+	/* The mic led is does not turn back on sysctl_set is called in the above loop */
+	acpi_ibm_mic_led_set(sc, sc->mic_led_state);
+
 	return (0);
 }
 
@@ -739,6 +780,12 @@
 		else
 			val = -1;
 		break;
+	case ACPI_IBM_METHOD_MIC_LED:
+		if (sc->mic_led_handle)
+			return sc->mic_led_state;
+		else
+			val = -1;
+		break;
 	}
 
 	return (val);
@@ -783,6 +830,10 @@
 		return acpi_ibm_mute_set(sc, arg);
 		break;
 
+	case ACPI_IBM_METHOD_MIC_LED:
+		return acpi_ibm_mic_led_set (sc, arg);
+		break;
+
 	case ACPI_IBM_METHOD_THINKLIGHT:
 		return acpi_ibm_thinklight_set(sc, arg);
 		break;
@@ -842,6 +893,17 @@
 		/* EC is required here, which was already checked before */
 		return (TRUE);
 
+	case ACPI_IBM_METHOD_MIC_LED:
+		if (ACPI_SUCCESS(AcpiGetHandle(sc->handle, "MMTS", &sc->mic_led_handle)))
+		{
+			/* Turn off mic led by default */
+			acpi_ibm_mic_led_set (sc, 0);
+			return(TRUE);
+		}
+		else
+			sc->mic_led_handle = NULL;
+		return (FALSE);
+
 	case ACPI_IBM_METHOD_THINKLIGHT:
 		sc->cmos_handle = NULL;
 		sc->light_get_supported = ACPI_SUCCESS(acpi_GetInteger(