--- kernel/nv-acpi.c.old	2014-01-24 04:20:14.406311120 +0100
+++ kernel/nv-acpi.c	2014-01-24 04:21:41.109642416 +0100
@@ -303,7 +303,10 @@
 
     if (pNvAcpiObject->notify_handler_installed)
     {
+		#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
+		/* beginning with 3.13, acpi_remove_notify_handler() waits for events to finish */
         NV_ACPI_OS_WAIT_EVENTS_COMPLETE();
+		#endif
 
         // remove event notifier
         status = acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, nv_acpi_event);