diff --git a/hw/xfree86/modes/xf86Crtc.c b/hw/xfree86/modes/xf86Crtc.c
index 4d5d7b8..d7351de 100644
--- a/hw/xfree86/modes/xf86Crtc.c
+++ b/hw/xfree86/modes/xf86Crtc.c
@@ -96,6 +96,7 @@ xf86CrtcCreate (ScrnInfoPtr		scrn,
     crtc = xcalloc (sizeof (xf86CrtcRec), 1);
     if (!crtc)
 	return NULL;
+    crtc->version = XF86_CRTC_VERSION;
     crtc->scrn = scrn;
     crtc->funcs = funcs;
 #ifdef RANDR_12_INTERFACE
@@ -546,6 +547,7 @@ xf86OutputCreate (ScrnInfoPtr		    scrn,
     output = xcalloc (sizeof (xf86OutputRec) + len, 1);
     if (!output)
 	return NULL;
+    output->version = XF86_OUTPUT_VERSION;
     output->scrn = scrn;
     output->funcs = funcs;
     if (name)
diff --git a/hw/xfree86/modes/xf86Crtc.h b/hw/xfree86/modes/xf86Crtc.h
index cc045b2..96da197 100644
--- a/hw/xfree86/modes/xf86Crtc.h
+++ b/hw/xfree86/modes/xf86Crtc.h
@@ -72,8 +72,15 @@ typedef enum _xf86OutputStatus {
    XF86OutputStatusUnknown
 } xf86OutputStatus;
 
+#define XF86_CRTC_VERSION 1
+
 typedef struct _xf86CrtcFuncs {
    /**
+    * ABI versioning, see xf86CrtcCreate
+    */
+   int version;
+
+   /**
     * Turns the crtc on/off, or sets intermediate power levels if available.
     *
     * Unsupported intermediate modes drop to the lower power setting.  If the
@@ -306,8 +313,15 @@ struct _xf86Crtc {
     BoxRec	    bounds;
 };
 
+#define XF86_OUTPUT_VERSION 1
+
 typedef struct _xf86OutputFuncs {
     /**
+     * ABI versioning, see xf86OutputCreate
+     */
+    int version;
+
+    /**
      * Called to allow the output a chance to create properties after the
      * RandR objects have been created.
      */
@@ -410,6 +424,14 @@ typedef struct _xf86OutputFuncs {
 		    Atom property,
 		    RRPropertyValuePtr value);
 #endif
+#ifdef RANDR_13_INTERFACE
+    /**
+     * Callback to get an updated property value
+     */
+    Bool
+    (*get_property)(xf86OutputPtr output,
+		    Atom property);
+#endif
     /**
      * Clean up driver-specific bits of the output
      */
diff --git a/hw/xfree86/modes/xf86RandR12.c b/hw/xfree86/modes/xf86RandR12.c
index e2668fb..8b13758 100644
--- a/hw/xfree86/modes/xf86RandR12.c
+++ b/hw/xfree86/modes/xf86RandR12.c
@@ -848,6 +848,20 @@ xf86RandR12OutputSetProperty (ScreenPtr pScreen,
 }
 
 static Bool
+xf86RandR13OutputGetProperty (ScreenPtr pScreen,
+			      RROutputPtr randr_output,
+			      Atom property)
+{
+    xf86OutputPtr output = randr_output->devPrivate;
+
+    if (output->funcs->get_property == NULL)
+	return TRUE;
+
+    /* Should be safe even w/o vtSema */
+    return output->funcs->get_property(output, property);
+}
+
+static Bool
 xf86RandR12OutputValidateMode (ScreenPtr    pScreen,
 			       RROutputPtr  randr_output,
 			       RRModePtr    randr_mode)
@@ -1126,6 +1140,9 @@ xf86RandR12Init12 (ScreenPtr pScreen)
     rp->rrCrtcSetGamma = xf86RandR12CrtcSetGamma;
     rp->rrOutputSetProperty = xf86RandR12OutputSetProperty;
     rp->rrOutputValidateMode = xf86RandR12OutputValidateMode;
+#if RANDR_13_INTERFACE
+    rp->rrOutputGetProperty = xf86RandR13OutputGetProperty;
+#endif
     rp->rrModeDestroy = xf86RandR12ModeDestroy;
     rp->rrSetConfig = NULL;
     pScrn->PointerMoved = xf86RandR12PointerMoved;
diff --git a/randr/mirandr.c b/randr/mirandr.c
index 3c4991e..7777853 100644
--- a/randr/mirandr.c
+++ b/randr/mirandr.c
@@ -74,6 +74,14 @@ miRROutputSetProperty (ScreenPtr	    pScreen,
 }
 
 Bool
+miRROutputGetProperty (ScreenPtr	    pScreen,
+		       RROutputPtr	    output,
+		       Atom		    property)
+{
+	return TRUE;
+}
+
+Bool
 miRROutputValidateMode (ScreenPtr	    pScreen,
 			RROutputPtr	    output,
 			RRModePtr	    mode)
@@ -116,6 +124,9 @@ miRandRInit (ScreenPtr pScreen)
     pScrPriv->rrCrtcSet = miRRCrtcSet;
     pScrPriv->rrCrtcSetGamma = miRRCrtcSetGamma;
     pScrPriv->rrOutputSetProperty = miRROutputSetProperty;
+#if RANDR_13_INTERFACE
+    pScrPriv->rrOutputGetProperty = miRROutputGetProperty;
+#endif
     pScrPriv->rrOutputValidateMode = miRROutputValidateMode;
     pScrPriv->rrModeDestroy = miRRModeDestroy;
     
diff --git a/randr/randrstr.h b/randr/randrstr.h
index e8358bc..3b48f5c 100644
--- a/randr/randrstr.h
+++ b/randr/randrstr.h
@@ -54,6 +54,7 @@
 /* required for ABI compatibility for now */
 #define RANDR_10_INTERFACE 1
 #define RANDR_12_INTERFACE 1
+#define RANDR_13_INTERFACE 1 /* requires RANDR_12_INTERFACE */
 
 typedef XID	RRMode;
 typedef XID	RROutput;
@@ -175,6 +176,12 @@ typedef void (*RRModeDestroyProcPtr) (ScreenPtr	    pScreen,
 
 #endif
 
+#if RANDR_13_INTERFACE
+typedef Bool (*RROutputGetPropertyProcPtr) (ScreenPtr		pScreen,
+					    RROutputPtr		output,
+					    Atom		property);
+#endif /* RANDR_13_INTERFACE */
+
 typedef Bool (*RRGetInfoProcPtr) (ScreenPtr pScreen, Rotation *rotations);
 typedef Bool (*RRCloseScreenProcPtr) ( int i, ScreenPtr pscreen);
 
@@ -220,6 +227,9 @@ typedef struct _rrScrPriv {
     RROutputValidateModeProcPtr	rrOutputValidateMode;
     RRModeDestroyProcPtr	rrModeDestroy;
 #endif
+#if RANDR_13_INTERFACE
+    RROutputGetPropertyProcPtr	rrOutputGetProperty;
+#endif
     
     /*
      * Private part of the structure; not considered part of the ABI
diff --git a/randr/rrproperty.c b/randr/rrproperty.c
index 4617064..d71a662 100644
--- a/randr/rrproperty.c
+++ b/randr/rrproperty.c
@@ -300,13 +300,21 @@ RRPropertyValuePtr
 RRGetOutputProperty (RROutputPtr output, Atom property, Bool pending)
 {
     RRPropertyPtr   prop = RRQueryOutputProperty (output, property);
+    rrScrPrivPtr    pScrPriv = rrGetScrPriv(output->pScreen);
 
     if (!prop)
 	return NULL;
     if (pending && prop->is_pending)
 	return &prop->pending;
-    else
+    else {
+#if RANDR_13_INTERFACE
+	/* If we can, try to update the property value first */
+	if (pScrPriv->rrOutputGetProperty)
+	    pScrPriv->rrOutputGetProperty(output->pScreen, output,
+					  prop->propertyName);
+#endif
 	return &prop->current;
+    }
 }
 
 int