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diff --git a/kipi-plugins/slideshow/screenproperties.cpp b/kipi-plugins/slideshow/screenproperties.cpp
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+/* ============================================================
+ *
+ * This file is a part of kipi-plugins project
+ * http://www.kipi-plugins.org
+ *
+ * Date        : 2007-11-14
+ * Description : a kipi plugin to slide images.
+ *
+ * Copyright (C) 2007 by Valerio Fuoglio <valerio dot fuoglio at gmail dot com>
+ *
+ * Parts of this code are based on smoothslidesaver by Carsten Weinhold 
+ * <carsten dot weinhold at gmx dot de>                                           
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General
+ * Public License as published by the Free Software Foundation;
+ * either version 2, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * ============================================================ */
+
+// Qt includes.
+
+#include <qapplication.h>
+
+// X11 includes.
+
+#include <X11/Xlib.h>
+#include <X11/extensions/Xrandr.h>
+
+// Local includes.
+
+#include "screenproperties.h"
+
+namespace KIPISlideShowPlugin
+{
+
+  ScreenProperties::ScreenProperties(QWidget *mainWidget) {
+  
+      activeScreen = QApplication::desktop()->screenNumber(mainWidget);
+  }
+    
+  unsigned ScreenProperties::suggestFrameRate() {
+  
+      int eventBase, errorBase;
+      if ( !XRRQueryExtension(qt_xdisplay(), &eventBase, &errorBase)) {
+          // No information, make a lucky guess on based on that ;)
+          return 25;
+      }
+  
+      // ask X11 for the refresh rate of the current screen
+      XRRScreenConfiguration* config;
+      int screenRate;
+  
+      config        = XRRGetScreenInfo(qt_xdisplay(), RootWindow(qt_xdisplay(),
+                                      activeScreen));
+      screenRate    = XRRConfigCurrentRate(config);
+      XRRFreeScreenConfigInfo(config);
+      //qDebug("monitor refresh rate %d Hz", screenRate);
+  
+      // Find the frame rate, that matches the monitor's refresh rate best.
+      // We will choose between 25, 28 and 30 Hz, to get smooth animations.
+      // The following frame rate will be chosen according to the monitor's
+      // refresh rate:
+      //
+      // Frame rate:   Monitor refresh rate
+      // 25 Hz         (50), 75, 100 Hz (PAL compliant setups)
+      // 28 Hz         85 Hz, 110 Hz    (seems to work ok)
+      // 30 Hz         60, 90, 120 Hz   (NTSC compliant setups)
+      //
+      // However, this will only work, if the kernel can schedule the
+      // screensaver at the right time (a 2.6.x kernel should work fine,
+      // because of the high HZ value).
+      int candidateRate[3] = { 30, 25, 28 };
+      int bestRate = candidateRate[0];
+      int smallestError = 1000, i = 0;
+      do {
+          int r     = candidateRate[i];
+          int error = QMIN(screenRate % r, (screenRate + r) % r);
+          
+          if (error < smallestError) {
+              smallestError = error;
+              bestRate      = r;
+          }
+      } while (++i < 3);
+  
+      //qDebug("using %d Hz as framerate for effects", bestRate);
+      return bestRate;
+  }
+  
+    bool ScreenProperties::enableVSync() {
+  
+      // currently only supported on NVidia hardware using the
+      // proprietary driver
+  
+      // For NVidia graphics cards: always use sync-to-vblank
+    //  return (setenv("__GL_SYNC_TO_VBLANK", "1", 1) == 0);
+        return false;
+  }
+
+}  // NameSpace KIPISlideShowPlugin