Export the actual LID state via sysctl. This allows more complex

policies about when to suspend based on other events happening AND the
lid being closed through the use of clever devd or other scripts.

sys/dev/acpica/acpi_lid.c

@@ -122,6 +122,14 @@ acpi_lid_attach(device_t dev)
     if (acpi_parse_prw(sc->lid_handle, &prw) == 0)
 	AcpiEnableGpe(prw.gpe_handle, prw.gpe_bit);
 
+    /*
+     * Export the lid status
+     */
+    SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
+	SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
+	"state", CTLFLAG_RD, &sc->lid_status, 0,
+	"Device set to wake the system");
+
     return (0);
 }