--- NVIDIA-Linux-x86_64-331.38.orig/kernel/nv-acpi.c    2014-01-09 03:49:24.000000000 +0100
+++ NVIDIA-Linux-x86_64-331.38/kernel/nv-acpi.c 2014-01-21 18:06:36.273400395 +0100
@@ -303,7 +303,11 @@ static int nv_acpi_remove(struct acpi_de

     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);