diff -ru vcl.orig/unx/gtk/app/gtkdata.cxx vcl/unx/gtk/app/gtkdata.cxx
--- vcl.orig/unx/gtk/app/gtkdata.cxx	2010-06-15 14:16:38.000000000 +0100
+++ vcl/unx/gtk/app/gtkdata.cxx	2010-06-15 14:16:50.000000000 +0100
@@ -217,11 +217,12 @@
             {
                 gint nMonitors = gdk_screen_get_n_monitors(pScreen);
                 m_aXineramaScreens = std::vector<Rectangle>();
+                m_aXineramaScreenIndexMap = std::vector<int>(nMonitors);
                 for (gint i = 0; i < nMonitors; ++i)
                 {
                     GdkRectangle dest;
                     gdk_screen_get_monitor_geometry(pScreen, i, &dest);
-                    addXineramaScreenUnique( dest.x, dest.y, dest.width, dest.height );
+                    addXineramaScreenUnique( i, dest.x, dest.y, dest.width, dest.height );
                 }
                 m_bXinerama = m_aXineramaScreens.size() > 1;
                 if( ! m_aFrames.empty() )
@@ -235,6 +236,32 @@
     }
 }
 
+extern "C"
+{
+    typedef gint(* screen_get_primary_monitor)(GdkScreen *screen);
+}
+
+int GtkSalDisplay::GetDefaultMonitorNumber() const
+{
+    GdkScreen* pScreen = gdk_display_get_screen( m_pGdkDisplay, m_nDefaultScreen );
+#if GTK_CHECK_VERSION(2,20,0)
+    return m_aXineramaScreenIndexMap[gdk_screen_get_primary_monitor(pScreen)];
+#else
+    static screen_get_primary_monitor sym_gdk_screen_get_primary_monitor =
+        (screen_get_primary_monitor)osl_getAsciiFunctionSymbol( GetSalData()->m_pPlugin, "gdk_screen_get_primary_monitor" );
+    if (sym_gdk_screen_get_primary_monitor)
+        return sym_gdk_screen_get_primary_monitor( pScreen );
+    //gdk_screen_get_primary_monitor unavailable, take the first laptop monitor as the default
+    gint nMonitors = gdk_screen_get_n_monitors(pScreen);
+    for (gint i = 0; i < nMonitors; ++i)
+    {
+        if (g_ascii_strncasecmp (gdk_screen_get_monitor_plug_name(pScreen, i), "LVDS", 4) == 0)
+            return m_aXineramaScreenIndexMap[i];
+    }
+    return 0;
+#endif
+}
+
 void GtkSalDisplay::initScreen( int nScreen ) const
 {
     if( nScreen < 0 || nScreen >= static_cast<int>(m_aScreens.size()) )
diff -ru vcl.orig/unx/inc/plugins/gtk/gtkdata.hxx vcl/unx/inc/plugins/gtk/gtkdata.hxx
--- vcl.orig/unx/inc/plugins/gtk/gtkdata.hxx	2010-06-15 14:16:38.000000000 +0100
+++ vcl/unx/inc/plugins/gtk/gtkdata.hxx	2010-06-15 14:16:50.000000000 +0100
@@ -73,6 +73,8 @@
     virtual long Dispatch( XEvent *pEvent );
     virtual void initScreen( int nScreen ) const;
 
+    virtual int GetDefaultMonitorNumber() const;
+
     static GdkFilterReturn filterGdkEvent( GdkXEvent* sys_event,
                                            GdkEvent* event,
                                            gpointer data );
diff -ru vcl.orig/unx/inc/saldisp.hxx vcl/unx/inc/saldisp.hxx
--- vcl.orig/unx/inc/saldisp.hxx	2010-06-15 14:16:38.000000000 +0100
+++ vcl/unx/inc/saldisp.hxx	2010-06-15 14:18:34.000000000 +0100
@@ -389,6 +389,7 @@
 
     bool			m_bXinerama;
     std::vector< Rectangle > m_aXineramaScreens;
+    std::vector< int > m_aXineramaScreenIndexMap;
     std::list<SalFrame*> m_aFrames;
     std::list<SalObject*> m_aSalObjects;
     
@@ -404,7 +405,7 @@
     int             processRandREvent( XEvent* );
 
     void			doDestruct();
-    void            addXineramaScreenUnique( long i_nX, long i_nY, long i_nWidth, long i_nHeight );
+    void            addXineramaScreenUnique( int i, long i_nX, long i_nY, long i_nWidth, long i_nHeight );
 public:
 	static	SalDisplay	   *GetSalDisplay( Display* display );
 	static	BOOL			BestVisual( Display     *pDisp,
@@ -474,6 +475,7 @@
 	XLIB_Window		GetDrawable( int nScreen ) const { return getDataForScreen( nScreen ).m_aRefWindow; }
 	Display		   *GetDisplay() const { return pDisp_; }
 	int				GetDefaultScreenNumber() const { return m_nDefaultScreen; }
+	virtual int		GetDefaultMonitorNumber() const { return 0; }
     const Size&     GetScreenSize( int nScreen ) const { return getDataForScreen( nScreen ).m_aSize; }
 	srv_vendor_t	GetServerVendor() const { return meServerVendor; }
 	void			SetServerVendor() { meServerVendor = sal_GetServerVendor(pDisp_); }
diff -ru vcl.orig/unx/source/app/saldisp.cxx vcl/unx/source/app/saldisp.cxx
--- vcl.orig/unx/source/app/saldisp.cxx	2010-06-15 14:16:38.000000000 +0100
+++ vcl/unx/source/app/saldisp.cxx	2010-06-15 14:18:15.000000000 +0100
@@ -2592,7 +2592,7 @@
              sal::static_int_cast< unsigned int >(GetVisual(m_nDefaultScreen).GetVisualId()) );
 }
 
-void SalDisplay::addXineramaScreenUnique( long i_nX, long i_nY, long i_nWidth, long i_nHeight )
+void SalDisplay::addXineramaScreenUnique( int i, long i_nX, long i_nY, long i_nWidth, long i_nHeight )
 {
     // see if any frame buffers are at the same coordinates
     // this can happen with weird configuration e.g. on
@@ -2606,11 +2606,13 @@
             if( m_aXineramaScreens[n].GetWidth() < i_nWidth ||
                 m_aXineramaScreens[n].GetHeight() < i_nHeight )
             {
+                m_aXineramaScreenIndexMap[i] = n;
                 m_aXineramaScreens[n].SetSize( Size( i_nWidth, i_nHeight ) );
             }
             return;
         }
     }
+    m_aXineramaScreenIndexMap[i] = m_aXineramaScreens.size();
     m_aXineramaScreens.push_back( Rectangle( Point( i_nX, i_nY ), Size( i_nWidth, i_nHeight ) ) );
 }
 
@@ -2638,7 +2640,7 @@
             m_bXinerama = true;
             m_aXineramaScreens = std::vector<Rectangle>();
             for( int i = 0; i < nFramebuffers; i++ )
-                addXineramaScreenUnique( pFramebuffers[i].x,
+                addXineramaScreenUnique( i, pFramebuffers[i].x,
                                          pFramebuffers[i].y,
                                          pFramebuffers[i].width,
                                          pFramebuffers[i].height );
@@ -2656,7 +2658,7 @@
             m_aXineramaScreens = std::vector<Rectangle>();
             for( int i = 0; i < nFramebuffers; i++ )
             {
-                addXineramaScreenUnique( pScreens[i].x_org,
+                addXineramaScreenUnique( i, pScreens[i].x_org,
                                          pScreens[i].y_org,
                                          pScreens[i].width,
                                          pScreens[i].height );
diff -ru vcl.orig/unx/source/app/salsys.cxx vcl/unx/source/app/salsys.cxx
--- vcl.orig/unx/source/app/salsys.cxx	2010-06-15 14:16:38.000000000 +0100
+++ vcl/unx/source/app/salsys.cxx	2010-06-15 14:16:51.000000000 +0100
@@ -71,7 +71,7 @@
 unsigned int X11SalSystem::GetDefaultDisplayNumber()
 {
     SalDisplay* pSalDisp = GetX11SalData()->GetDisplay();
-    return pSalDisp->GetDefaultScreenNumber();
+    return pSalDisp->IsXinerama() ? pSalDisp->GetDefaultMonitorNumber() : pSalDisp->GetDefaultScreenNumber();
 }
 
 Rectangle X11SalSystem::GetDisplayScreenPosSizePixel( unsigned int nScreen )