--- xorg-server-1.9.1/Xext/sync.c	2010-11-16 23:11:56.751124639 -0500
+++ xorg-server-1.9.1/Xext/sync.c	2010-11-16 23:13:16.327862535 -0500
@@ -2264,8 +2264,44 @@ 
 static void
 IdleTimeQueryValue (pointer pCounter, CARD64 *pValue_return)
 {
-    CARD32 idle = GetTimeInMillis() - lastDeviceEventTime.milliseconds;
+    static CARD32 previousLastDeviceEventTimeMilliseconds = 0;
+    CARD32        now              = GetTimeInMillis();
+    CARD32        idle             = now - lastDeviceEventTime.milliseconds;
+    CARD32        previousIdle     = now - previousLastDeviceEventTimeMilliseconds;
+    SyncCounter  *pIdleTimeCounter = (SyncCounter*)pCounter;
+
     XSyncIntsToValue (pValue_return, idle, 0);
+
+    if (pCounter == NULL)
+    {
+        return;
+    }
+    if (previousLastDeviceEventTimeMilliseconds == 0)
+    {
+        /* initialize static var when this function is invoked the first time. */
+        previousLastDeviceEventTimeMilliseconds = lastDeviceEventTime.milliseconds;
+        return;
+    }
+
+    if (previousLastDeviceEventTimeMilliseconds == lastDeviceEventTime.milliseconds)
+    {
+        /* no new user event, no need to change idle counter. */
+        return;
+    }
+    previousLastDeviceEventTimeMilliseconds = lastDeviceEventTime.milliseconds;
+
+    /*
+     * Some user event occured; now update idle counter with previous
+     * event time, so idle counter has the most up-to-date value with
+     * respect to previous user event (we need old and new counter
+     * value to compute if a transition occured).  Recompute bracket
+     * values if this is system counter.
+     */
+
+    XSyncIntsToValue  (&pIdleTimeCounter->value, previousIdle, 0);
+    if (IsSystemCounter(pIdleTimeCounter)) {
+        SyncComputeBracketValues(pIdleTimeCounter);
+    }
 }
 
 static void
@@ -2342,7 +2378,7 @@ 
     if (!pIdleTimeValueLess && !pIdleTimeValueGreater)
 	return;
 
-    IdleTimeQueryValue (NULL, &idle);
+    IdleTimeQueryValue (IdleTimeCounter, &idle);
 
     if ((pIdleTimeValueGreater &&
          XSyncValueGreaterOrEqual (idle, *pIdleTimeValueGreater)) ||