diff -rup xf86-input-synaptics-1.2.2/src/synaptics.c xf86-input-synaptics-1.2.2-drk/src/synaptics.c
--- xf86-input-synaptics-1.2.2/src/synaptics.c	2010-03-26 02:13:40.000000000 -0300
+++ xf86-input-synaptics-1.2.2-drk/src/synaptics.c	2010-08-20 17:13:48.000000000 -0300
@@ -1641,7 +1641,9 @@ ComputeDeltas(SynapticsPrivate *priv, st
 		dx = dx * dtime * para->trackstick_speed;
 		dy = dy * dtime * para->trackstick_speed;
 	    } else if (moving_state == MS_TOUCHPAD_RELATIVE) {
-		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) {