--- a/dwm.c	Mon Jul 20 17:08:34 2009 +0100
+++ b/dwm.c	Tue Jul 21 08:57:04 2009 +0100
@@ -1683,7 +1683,7 @@
 
 void
 updategeom(void) {
-	int i, n = 1;
+	int i, n = 1, nn;
 	Client *c;
 	Monitor *newmons = NULL, *m = NULL, *tm;
 
@@ -1692,6 +1692,11 @@
 
 	if(XineramaIsActive(dpy))
 		info = XineramaQueryScreens(dpy, &n);
+	for(i = 1, nn = n; i < n; i++)
+		if(info[i - 1].x_org == info[i].x_org && info[i - 1].y_org == info[i].y_org
+		&& info[i - 1].width == info[i].width && info[i - 1].height == info[i].height)
+			--nn;
+	n = nn; /* we only consider unique geometrys as separate screens */
 #endif /* XINERAMA */
 	/* allocate monitor(s) for the new geometry setup */
 	for(i = 0; i < n; i++) {