diff --git a/effects.cpp b/effects.cpp
index e8413de3e8..4b19a4d336 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -504,6 +504,25 @@ void EffectsHandlerImpl::addRepaint( int x, int y, int w, int h )
     Workspace::self()->addRepaint( x, y, w, h );
     }
 
+int EffectsHandlerImpl::activeScreen() const
+    {
+    return Workspace::self()->activeScreen();
+    }
+
+QRect EffectsHandlerImpl::clientArea( clientAreaOption opt, int screen, int desktop ) const
+    {
+    return Workspace::self()->clientArea( opt, screen, desktop );
+    }
+
+QRect EffectsHandlerImpl::clientArea( clientAreaOption opt, const EffectWindow* c ) const
+    {
+    const Toplevel* t = static_cast< const EffectWindowImpl* >(c)->window();
+    if( const Client* cl = dynamic_cast< const Client* >( t ))
+        return Workspace::self()->clientArea( opt, cl );
+    else
+        return Workspace::self()->clientArea( opt, t->geometry().center(), Workspace::self()->currentDesktop());
+    }
+
 QRect EffectsHandlerImpl::clientArea( clientAreaOption opt, const QPoint& p, int desktop ) const
     {
     return Workspace::self()->clientArea( opt, p, desktop );
diff --git a/effects.h b/effects.h
index 666447006b..dc1c7e1dbc 100644
--- a/effects.h
+++ b/effects.h
@@ -75,7 +75,10 @@ class EffectsHandlerImpl : public EffectsHandler
         virtual void addRepaintFull();
         virtual void addRepaint( const QRect& r );
         virtual void addRepaint( int x, int y, int w, int h );
-        virtual QRect clientArea( clientAreaOption opt, const QPoint& p, int desktop ) const;
+        virtual int activeScreen() const;
+        virtual QRect clientArea( clientAreaOption, int screen, int desktop ) const;
+        virtual QRect clientArea( clientAreaOption, const EffectWindow* c ) const;
+        virtual QRect clientArea( clientAreaOption, const QPoint& p, int desktop ) const;
         virtual void calcDesktopLayout(int* x, int* y, Qt::Orientation* orientation) const;
         virtual bool optionRollOverDesktops() const;
         virtual int desktopToLeft( int desktop, bool wrap ) const;
diff --git a/effects/presentwindows.cpp b/effects/presentwindows.cpp
index 271a4ad6aa..69926836df 100644
--- a/effects/presentwindows.cpp
+++ b/effects/presentwindows.cpp
@@ -413,7 +413,7 @@ void PresentWindowsEffect::calculateWindowTransformationsDumb(EffectWindowList w
     int rows = windowlist.count() / 4 + 1;
     int cols = windowlist.count() / rows + windowlist.count() % rows;
     // Get rect which we can use on current desktop. This excludes e.g. panels
-    QRect placementRect = effects->clientArea( PlacementArea, QPoint( 0, 0 ), 0 );
+    QRect placementRect = effects->clientArea( PlacementArea, effects->activeScreen(), effects->currentDesktop());
     // Size of one cell
     int cellwidth = placementRect.width() / cols;
     int cellheight = placementRect.height() / rows;
@@ -459,7 +459,7 @@ int PresentWindowsEffect::windowHeightForWidth(EffectWindow* c, int w)
 void PresentWindowsEffect::calculateWindowTransformationsKompose(EffectWindowList windowlist)
     {
      // Get rect which we can use on current desktop. This excludes e.g. panels
-    QRect availRect = effects->clientArea( PlacementArea, QPoint( 0, 0 ), effects->currentDesktop());
+    QRect availRect = effects->clientArea( PlacementArea, effects->activeScreen(), effects->currentDesktop());
 
     // Following code is taken from Kompose 0.5.4, src/komposelayout.cpp
 
@@ -597,7 +597,7 @@ void PresentWindowsEffect::calculateWindowTransformationsKompose(EffectWindowLis
 
 void PresentWindowsEffect::calculateWindowTransformationsClosest(EffectWindowList windowlist)
     {
-    QRect area = effects->clientArea( PlacementArea, QPoint( 0, 0 ), effects->currentDesktop());
+    QRect area = effects->clientArea( PlacementArea, effects->activeScreen(), effects->currentDesktop());
     int columns = int( ceil( sqrt( windowlist.count())));
     int rows = int( ceil( windowlist.count() / double( columns )));
     foreach( EffectWindow* w, windowlist )
@@ -726,7 +726,7 @@ void PresentWindowsEffect::getBestAssignments()
 
 bool PresentWindowsEffect::canRearrangeClosest(EffectWindowList windowlist)
     {
-    QRect area = effects->clientArea( PlacementArea, QPoint( 0, 0 ), effects->currentDesktop());
+    QRect area = effects->clientArea( PlacementArea, effects->activeScreen(), effects->currentDesktop());
     int columns = int( ceil( sqrt( windowlist.count())));
     int rows = int( ceil( windowlist.count() / double( columns )));
     int old_columns = int( ceil( sqrt( mWindowData.count())));
@@ -817,7 +817,7 @@ void PresentWindowsEffect::updateFilterTexture()
     QRect rect;
     QString translatedString = i18n( "Filter:\n%1", windowFilter );
     rect.setSize( fm.size( 0, translatedString ));
-    QRect area = effects->clientArea( PlacementArea, QPoint( 0, 0 ), effects->currentDesktop());
+    QRect area = effects->clientArea( PlacementArea, effects->activeScreen(), effects->currentDesktop());
     // Create image
     QImage im( rect.width(), rect.height(), QImage::Format_ARGB32 );
     im.fill( Qt::transparent );
diff --git a/effects/test/demo_showpicture.cpp b/effects/test/demo_showpicture.cpp
index d20e21d50d..c3c11e4e9a 100644
--- a/effects/test/demo_showpicture.cpp
+++ b/effects/test/demo_showpicture.cpp
@@ -55,7 +55,7 @@ void ShowPictureEffect::loadPicture()
     if( file.isEmpty())
         return;
     QImage im( file );
-    QRect area = effects->clientArea( PlacementArea, QPoint( 0, 0 ), effects->currentDesktop());
+    QRect area = effects->clientArea( PlacementArea, effects->activeScreen(), effects->currentDesktop());
     picture = new GLTexture( im );
     pictureRect = QRect( area.x() + ( area.width() - im.width()) / 2,
         area.y() + ( area.height() - im.height()) / 2, im.width(), im.height());
diff --git a/effects/thumbnailaside.cpp b/effects/thumbnailaside.cpp
index 2e850de9d0..cb99fe3c9c 100644
--- a/effects/thumbnailaside.cpp
+++ b/effects/thumbnailaside.cpp
@@ -34,6 +34,7 @@ ThumbnailAsideEffect::ThumbnailAsideEffect()
     maxwidth = conf.readEntry("MaxWidth", 200);
     spacing = conf.readEntry("Spacing", 10);
     opacity = conf.readEntry("Opacity", 50) / 100.0;
+    screen = conf.readEntry("Screen",-1); // Xinerama screen TODO add gui option
     }
 
 void ThumbnailAsideEffect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
@@ -131,7 +132,7 @@ void ThumbnailAsideEffect::arrange()
         mwidth = qMax( mwidth, d.window->width());
         pos[ d.index ] = d.window->height();
         }
-    QRect area = effects->clientArea( WorkArea, QPoint(), effects->currentDesktop());
+    QRect area = effects->clientArea( WorkArea, screen, effects->currentDesktop());
     double scale = area.height() / double( height );
     scale = qMin( scale, maxwidth / double( mwidth )); // don't be wider than maxwidth pixels
     int add = 0;
diff --git a/effects/thumbnailaside.h b/effects/thumbnailaside.h
index 1b99ceaa42..4e37086138 100644
--- a/effects/thumbnailaside.h
+++ b/effects/thumbnailaside.h
@@ -53,6 +53,7 @@ class ThumbnailAsideEffect
         int maxwidth;
         int spacing;
         double opacity;
+        int screen;
     };
 
 } // namespace
diff --git a/lib/kwineffects.h b/lib/kwineffects.h
index 7f1e46d821..8f935dd242 100644
--- a/lib/kwineffects.h
+++ b/lib/kwineffects.h
@@ -345,6 +345,9 @@ class KWIN_EXPORT EffectsHandler
         virtual int numberOfDesktops() const = 0;
         virtual void setCurrentDesktop( int desktop ) = 0;
         virtual QString desktopName( int desktop ) const = 0;
+        virtual int activeScreen() const = 0; // Xinerama
+        virtual QRect clientArea( clientAreaOption, int screen, int desktop ) const = 0;
+        virtual QRect clientArea( clientAreaOption, const EffectWindow* c ) const = 0;
         virtual QRect clientArea( clientAreaOption, const QPoint& p, int desktop ) const = 0;
         virtual void calcDesktopLayout(int* x, int* y, Qt::Orientation* orientation) const = 0;
         virtual bool optionRollOverDesktops() const = 0;