--- rdesktop/configure.ac
+++ rdesktop/configure.ac
@@ -30,6 +30,8 @@
 AC_SEARCH_LIBS(socket, socket)
 AC_SEARCH_LIBS(inet_aton, resolv)
 
+AC_CHECK_LIB(Xinerama, XineramaQueryScreens, AC_DEFINE(HAVE_XINERAMA) LIBS="$LIBS -lXinerama", [], [])
+
 AC_CHECK_HEADER(sys/select.h, AC_DEFINE(HAVE_SYS_SELECT_H))
 AC_CHECK_HEADER(sys/modem.h, AC_DEFINE(HAVE_SYS_MODEM_H))
 AC_CHECK_HEADER(sys/filio.h, AC_DEFINE(HAVE_SYS_FILIO_H))
--- rdesktop/xwin.c
+++ rdesktop/xwin.c
@@ -31,6 +31,9 @@
 #ifdef HAVE_XRANDR
 #include <X11/extensions/Xrandr.h>
 #endif
+#ifdef HAVE_XINERAMA
+#include <X11/extensions/Xinerama.h>
+#endif
 
 extern int g_sizeopt;
 extern int g_width;
@@ -816,6 +819,66 @@
 #define LOUT24(o, x) { *(o++) = x; *(o++) = x >> 8; *(o++) = x >> 16; }
 #define LOUT32(o, x) { *(o++) = x; *(o++) = x >> 8; *(o++) = x >> 16; *(o++) = x >> 24; }
 
+#ifdef HAVE_XINERAMA
+void
+ScreenSize(XRectangle *screen)
+{
+	int screens;
+	int event_base;
+	int error_base;
+	int x, y, i, __unused_int;
+	unsigned int __unused_uint;
+	Window __unused_win;
+
+	if ((XineramaQueryExtension(g_display, &event_base, &error_base)) && (XineramaIsActive(g_display)))
+	{
+		XineramaScreenInfo *screeninfo;
+
+		/* getting current cursor position */
+		XQueryPointer(g_display, RootWindowOfScreen(g_screen), &__unused_win, &__unused_win, &x, &y, &__unused_int, &__unused_int, &__unused_uint);
+
+		/* Get the Xinerama screen infomation */
+		screeninfo = XineramaQueryScreens(g_display, &screens);
+
+		/* Search for the appropriate screen */
+		i = 0;
+		while (!  (screeninfo[i].x_org <= x
+			&& screeninfo[i].y_org <= y
+			&& screeninfo[i].x_org + screeninfo[i].width >= x
+			&& screeninfo[i].y_org + screeninfo[i].height >= y ))
+			i++;
+		if (i >= screens)
+			i = 0;
+
+		/* Position according to the present screen */
+		screen->x = screeninfo[i].x_org;
+		screen->y = screeninfo[i].y_org;
+		screen->width = screeninfo[i].width;
+		screen->height = screeninfo[i].height;
+
+		/* Free allocated memory */
+		XFree(screeninfo);
+	}
+	else
+	{
+		/* Xinerama is not in use, default to the XLib screensize call. */
+		screen->x = 0;
+		screen->y = 0;
+		screen->width = WidthOfScreen(g_screen);
+		screen->height = HeightOfScreen(g_screen);
+	}
+}
+#else
+void
+ScreenSize(XRectangle *screen)
+{
+	screen->x = 0;
+	screen->y = 0;
+	screen->width = WidthOfScreen(g_screen);
+	screen->height = HeightOfScreen(g_screen);
+}
+#endif
+
 static uint32
 translate_colour(uint32 colour)
 {
@@ -1912,17 +1975,26 @@
 	 */
 	if (g_fullscreen)
 	{
-		g_width = WidthOfScreen(g_screen);
-		g_height = HeightOfScreen(g_screen);
+		XRectangle screen;
+		ScreenSize(&screen);
+
+		g_width = screen.width;
+		g_height = screen.height;
 		g_using_full_workarea = True;
 	}
 	else if (g_sizeopt < 0)
 	{
+		XRectangle screen;
+		ScreenSize(&screen);
+
+		g_width = screen.width;
+		g_height = screen.height;
+
 		/* Percent of screen */
 		if (-g_sizeopt >= 100)
 			g_using_full_workarea = True;
-		g_height = HeightOfScreen(g_screen) * (-g_sizeopt) / 100;
-		g_width = WidthOfScreen(g_screen) * (-g_sizeopt) / 100;
+               g_width = screen.width * (-g_width) / 100;
+               g_height = screen.height * (-g_width) / 100;
 	}
 	else if (g_sizeopt == 1)
 	{
@@ -2005,14 +2077,19 @@
 	long input_mask, ic_input_mask;
 	XEvent xevent;
 
-	wndwidth = g_fullscreen ? WidthOfScreen(g_screen) : g_width;
-	wndheight = g_fullscreen ? HeightOfScreen(g_screen) : g_height;
+	XRectangle screen;
+	ScreenSize(&screen);
 
+	wndwidth = g_fullscreen ? screen.width : g_width;
+	wndheight = g_fullscreen ? screen.height : g_height;
+	g_xpos = g_fullscreen ? screen.x : g_xpos;
+	g_ypos = g_fullscreen ? screen.y : g_ypos;
+
 	/* Handle -x-y portion of geometry string */
 	if (g_xpos < 0 || (g_xpos == 0 && (g_pos & 2)))
-		g_xpos = WidthOfScreen(g_screen) + g_xpos - g_width;
+		g_xpos = screen.width + g_xpos - g_width;
 	if (g_ypos < 0 || (g_ypos == 0 && (g_pos & 4)))
-		g_ypos = HeightOfScreen(g_screen) + g_ypos - g_height;
+		g_ypos = screen.height + g_ypos - g_height;
 
 	get_window_attribs(&attribs);