Index: sys/dev/acpica/acpi.c
===================================================================
--- sys/dev/acpica/acpi.c
+++ sys/dev/acpica/acpi.c
@@ -2260,6 +2260,15 @@
 		/* Never disable PCI link devices. */
 		if (acpi_MatchHid(handle, "PNP0C0F"))
 		    break;
+
+		/*
+		 * RTC Device should be enabled for CMOS register space
+		 * unless FADT indicate it is not present.
+		 * (checked in RTC probe routine.)
+		 */
+		if (acpi_MatchHid(handle, "PNP0B00"))
+		    break;
+
 		/*
 		 * Docking stations should remain enabled since the system
 		 * may be undocked at boot.
Index: sys/x86/isa/atrtc.c
===================================================================
--- sys/x86/isa/atrtc.c
+++ sys/x86/isa/atrtc.c
@@ -369,8 +369,12 @@
 	/* Don't handle address space events if driver is disabled. */
 	if (acpi_disabled("atrtc"))
 		return (ENXIO);
+	device_printf(dev, "CMOS REGISTER\n");
+
+	if(ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, "\\_SB_", &sc->acpi_handle))){
+		return (ENXIO);
+	}
 
-	sc->acpi_handle = acpi_get_handle(dev);
 	if (sc->acpi_handle == NULL ||
 	    ACPI_FAILURE(AcpiInstallAddressSpaceHandler(sc->acpi_handle,
 	      ACPI_ADR_SPACE_CMOS, atrtc_acpi_cmos_handler, NULL, dev))) {