--- ../xorg-server-1.12.1/dix/getevents.c	2012-03-31 09:45:56.000000000 +0700
+++ ./getevents.c	2012-04-26 16:26:33.359648980 +0700
@@ -1435,7 +1435,17 @@
     if ((incr > 0 && delta < 0) || (incr < 0 && delta > 0))
         b--;                    /* we're scrolling up or left → button 4 or 6 */
 
-    while (fabs(delta) >= fabs(incr)) {
+    int bug = 0;
+
+    if (fabs(incr) > 0)
+    {
+        if ((fabs(delta) / fabs(incr)) > 100.0)
+            bug = 1;
+    }
+    else
+        bug = 1;
+
+    while ((fabs(delta) >= fabs(incr)) && (bug == 0)) {
         int nev_tmp;
 
         if (delta > 0)