diff --git a/sys/dev/acpica/acpi.c b/sys/dev/acpica/acpi.c
--- a/sys/dev/acpica/acpi.c
+++ b/sys/dev/acpica/acpi.c
@@ -3439,8 +3439,9 @@
     ACPI_SS_NONE	= 0,
     ACPI_SS_GPE_SET	= 1 << 0,
     ACPI_SS_DEV_SUSPEND	= 1 << 1,
-    ACPI_SS_SLP_PREP	= 1 << 2,
-    ACPI_SS_SLEPT	= 1 << 3,
+    ACPI_SS_SPMC_ENTER	= 1 << 2,
+    ACPI_SS_SLP_PREP	= 1 << 3,
+    ACPI_SS_SLEPT	= 1 << 4,
 };
 
 static void
@@ -3638,6 +3639,14 @@
     }
     slp_state |= ACPI_SS_DEV_SUSPEND;
 
+    if (sc->acpi_spmc_device != NULL) {
+	MPASS(sc->acpi_spmc_enter != NULL);
+	if (sc->acpi_spmc_enter(sc->acpi_spmc_device) != 0)
+	    device_printf(sc->acpi_dev, "failed to run SPMC entry\n");
+	else
+	    slp_state |= ACPI_SS_SPMC_ENTER;
+    }
+
     if (stype != POWER_STYPE_SUSPEND_TO_IDLE) {
 	status = AcpiEnterSleepStatePrep(acpi_sstate);
 	if (ACPI_FAILURE(status)) {
@@ -3687,6 +3696,13 @@
 	sc->acpi_stype = POWER_STYPE_AWAKE;
 	slp_state &= ~ACPI_SS_GPE_SET;
     }
+    if ((slp_state & ACPI_SS_SPMC_ENTER) != 0) {
+	MPASS(sc->acpi_spmc_device != NULL);
+	MPASS(sc->acpi_spmc_exit != NULL);
+	if (sc->acpi_spmc_exit(sc->acpi_spmc_device) != 0)
+	    device_printf(sc->acpi_dev, "failed to run SPMC exit\n");
+	slp_state &= ~ACPI_SS_SPMC_ENTER;
+    }
     if ((slp_state & ACPI_SS_DEV_SUSPEND) != 0) {
 	DEVICE_RESUME(root_bus);
 	slp_state &= ~ACPI_SS_DEV_SUSPEND;