--- osl_old.c	2014-01-22 10:28:02.997949468 +0200
+++ osl.c	2014-01-22 10:19:36.542903911 +0200
@@ -1169,7 +1169,7 @@ void acpi_os_wait_events_complete(void)
 	flush_workqueue(kacpid_wq);
 	flush_workqueue(kacpi_notify_wq);
 }
-
+EXPORT_SYMBOL(acpi_os_wait_events_complete);
 struct acpi_hp_work {
 	struct work_struct work;
 	acpi_hp_callback func;