From a08ea64ded83f3781df769eec074d563b03a718f Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter@cs.unisa.edu.au>
Date: Mon, 2 Jun 2008 11:04:41 +0930
Subject: [PATCH] kdrive: don't post motion event if there was no motion.
 #16179

Based on the patch by Tomas Janousek.

X.Org Bug 16179 <http://bugs.freedesktop.org/show_bug.cgi?id=16179>
(cherry picked from commit 26e7e69ab893d1f2b35213250ada40ec90944f62)
---
 hw/kdrive/src/kinput.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/hw/kdrive/src/kinput.c b/hw/kdrive/src/kinput.c
index df73942e7..a7eae3f95 100644
--- a/hw/kdrive/src/kinput.c
+++ b/hw/kdrive/src/kinput.c
@@ -2078,7 +2078,7 @@ KdEnqueuePointerEvent(KdPointerInfo *pi, unsigned long flags, int rx, int ry,
     int           (*matrix)[3] = kdPointerMatrix.matrix;
     unsigned long button;
     int           n;
-    int           dixflags;
+    int           dixflags = 0;
 
     if (!pi)
 	return;
@@ -2109,11 +2109,15 @@ KdEnqueuePointerEvent(KdPointerInfo *pi, unsigned long flags, int rx, int ry,
     z = rz;
 
     if (flags & KD_MOUSE_DELTA)
-        dixflags = POINTER_RELATIVE & POINTER_ACCELERATE;
-    else
-        dixflags = POINTER_ABSOLUTE;
+    {
+        if (x || y || z)
+            dixflags = POINTER_RELATIVE & POINTER_ACCELERATE;
+    } else if (x != pi->dixdev->last.valuators[0] ||
+                y != pi->dixdev->last.valuators[1])
+            dixflags = POINTER_ABSOLUTE;
 
-    _KdEnqueuePointerEvent(pi, MotionNotify, x, y, z, 0, dixflags, FALSE);
+    if (dixflags)
+        _KdEnqueuePointerEvent(pi, MotionNotify, x, y, z, 0, dixflags, FALSE);
 
     buttons = flags;