Index: /trunk/src/VBox/Additions/x11/vboxvideo/vboxvideo.c
===================================================================
--- /trunk/src/VBox/Additions/x11/vboxvideo/vboxvideo.c	(revision 53344)
+++ /trunk/src/VBox/Additions/x11/vboxvideo/vboxvideo.c	(revision 53345)
@@ -289,5 +289,5 @@
     unsigned cDisplay = (uintptr_t)crtc->driver_private;
     TRACE_LOG("cDisplay=%u, mode=%i\n", cDisplay, mode);
-    pVBox->pScreens[cDisplay].afDisabled = (mode != DPMSModeOn);
+    pVBox->pScreens[cDisplay].afDisabled = (mode == DPMSModeOff);
     /* Don't fiddle with the hardware if we are switched
      * to a virtual terminal. */