diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index ef8e659..2951a27 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1570,6 +1570,8 @@
 		printk(KERN_ERR PREFIX "Could not register bus type\n");
 	}
 
+	acpi_power_init();
+
 	/*
 	 * Enumerate devices in the ACPI namespace.
 	 */