Index: /trunk/src/VBox/Devices/PC/DevACPI.cpp
===================================================================
--- /trunk/src/VBox/Devices/PC/DevACPI.cpp	(revision 35590)
+++ /trunk/src/VBox/Devices/PC/DevACPI.cpp	(revision 35591)
@@ -2688,5 +2688,5 @@
 
     /* query whether S1 power state should be exposed */
-    rc = CFGMR3QueryBoolDef(pCfg, "PowerS1Enabled", &s->fS1Enabled, true);
+    rc = CFGMR3QueryBoolDef(pCfg, "PowerS1Enabled", &s->fS1Enabled, false);
     if (RT_FAILURE(rc))
         return PDMDEV_SET_ERROR(pDevIns, rc,