--- synaptics.c	2011-06-28 08:42:40.000000000 +0400
+++ synaptics.patched.c	2011-07-23 13:29:59.658986808 +0400
@@ -1811,7 +1811,9 @@
     int y_edge_speed = 0;
 
     /* HIST is full enough: priv->count_packet_finger > 3 */
-    *dx = estimate_delta(hw->x, HIST(0).x, HIST(1).x, HIST(2).x);
+#define REV para->right_edge
+#define MRE(X) (X)>REV?REV:(X)
+    *dx = estimate_delta(MRE(hw->x), MRE(HIST(0).x), MRE(HIST(1).x), MRE(HIST(2).x));
     *dy = estimate_delta(hw->y, HIST(0).y, HIST(1).y, HIST(2).y);
 
     if ((priv->tap_state == TS_DRAG) || para->edge_motion_use_always)