diff --git a/effects/logout/CMakeLists.txt b/effects/logout/CMakeLists.txt
index c3316bc21c..aa37fd7b1d 100644
--- a/effects/logout/CMakeLists.txt
+++ b/effects/logout/CMakeLists.txt
@@ -15,6 +15,13 @@ install( FILES
 
 # Data files
 install( FILES
-    logout/data/vignetting.frag
-    logout/data/logout-blur.frag
-    DESTINATION ${DATA_INSTALL_DIR}/kwin )
+    logout/data/1.10/vignetting.frag
+    logout/data/1.10/logout-blur.frag
+    DESTINATION ${DATA_INSTALL_DIR}/kwin/shaders/1.10
+)
+
+install( FILES
+    logout/data/1.40/vignetting.frag
+    logout/data/1.40/logout-blur.frag
+    DESTINATION ${DATA_INSTALL_DIR}/kwin/shaders/1.40
+)
diff --git a/effects/logout/data/logout-blur.frag b/effects/logout/data/1.10/logout-blur.frag
similarity index 100%
rename from effects/logout/data/logout-blur.frag
rename to effects/logout/data/1.10/logout-blur.frag
diff --git a/effects/logout/data/vignetting.frag b/effects/logout/data/1.10/vignetting.frag
similarity index 100%
rename from effects/logout/data/vignetting.frag
rename to effects/logout/data/1.10/vignetting.frag
diff --git a/effects/logout/data/logout-blur-140.frag b/effects/logout/data/1.40/logout-blur.frag
similarity index 100%
rename from effects/logout/data/logout-blur-140.frag
rename to effects/logout/data/1.40/logout-blur.frag
diff --git a/effects/logout/data/vignetting-140.frag b/effects/logout/data/1.40/vignetting.frag
similarity index 100%
rename from effects/logout/data/vignetting-140.frag
rename to effects/logout/data/1.40/vignetting.frag
diff --git a/effects/logout/logout.cpp b/effects/logout/logout.cpp
index 86ccc4e7ea..454bcf5a3e 100644
--- a/effects/logout/logout.cpp
+++ b/effects/logout/logout.cpp
@@ -50,6 +50,7 @@ LogoutEffect::LogoutEffect()
     , ignoredWindows()
     , m_vignettingShader(NULL)
     , m_blurShader(NULL)
+    , m_shadersDir("kwin/shaders/1.10/")
 {
     // Persistent effect
     logoutAtom = XInternAtom(display(), "_KDE_LOGGING_OUT", False);
@@ -71,6 +72,14 @@ LogoutEffect::LogoutEffect()
     connect(effects, SIGNAL(windowClosed(KWin::EffectWindow*)), this, SLOT(slotWindowClosed(KWin::EffectWindow*)));
     connect(effects, SIGNAL(windowDeleted(KWin::EffectWindow*)), this, SLOT(slotWindowDeleted(KWin::EffectWindow*)));
     connect(effects, SIGNAL(propertyNotify(KWin::EffectWindow*,long)), this, SLOT(slotPropertyNotify(KWin::EffectWindow*,long)));
+
+#ifdef KWIN_HAVE_OPENGLES
+    const qint64 coreVersionNumber = kVersionNumber(3, 0);
+#else
+    const qint64 coreVersionNumber = kVersionNumber(1, 40);
+#endif
+    if (GLPlatform::instance()->glslVersion() >= coreVersionNumber)
+        m_shadersDir = "kwin/shaders/1.40/";
 }
 
 LogoutEffect::~LogoutEffect()
@@ -296,10 +305,8 @@ void LogoutEffect::renderVignetting()
         return;
     }
     if (!m_vignettingShader) {
-        const char *shader = GLPlatform::instance()->glslVersion() >= kVersionNumber(1, 40) ?
-                                "kwin/vignetting-140.frag" : "kwin/vignetting.frag";
         m_vignettingShader = ShaderManager::instance()->loadFragmentShader(KWin::ShaderManager::ColorShader,
-                                                                           KGlobal::dirs()->findResource("data", shader));
+                                                                           KGlobal::dirs()->findResource("data", m_shadersDir + "vignetting.frag"));
         if (!m_vignettingShader->isValid()) {
             kDebug(1212) << "Vignetting Shader failed to load";
             return;
@@ -378,10 +385,8 @@ void LogoutEffect::renderBlurTexture()
         return;
     }
     if (!m_blurShader) {
-        const char *shader = GLPlatform::instance()->glslVersion() >= kVersionNumber(1, 40) ?
-                                "kwin/logout-blur-140.frag" : "kwin/logout-blur.frag";
         m_blurShader = ShaderManager::instance()->loadFragmentShader(KWin::ShaderManager::SimpleShader,
-                                                                     KGlobal::dirs()->findResource("data", shader));
+                                                                     KGlobal::dirs()->findResource("data", m_shadersDir + "logout-blur.frag"));
         if (!m_blurShader->isValid()) {
             kDebug(1212) << "Logout blur shader failed to load";
         }
diff --git a/effects/logout/logout.h b/effects/logout/logout.h
index 18fe279232..dee53bc992 100644
--- a/effects/logout/logout.h
+++ b/effects/logout/logout.h
@@ -82,6 +82,7 @@ private:
     QHash< EffectWindow*, double > windowsOpacities;
     GLShader *m_vignettingShader;
     GLShader *m_blurShader;
+    QString m_shadersDir;
 };
 
 } // namespace
diff --git a/lanczosfilter.cpp b/lanczosfilter.cpp
index 8a20a47d17..4fa09e7dfc 100644
--- a/lanczosfilter.cpp
+++ b/lanczosfilter.cpp
@@ -184,28 +184,14 @@ void LanczosFilter::performPaint(EffectWindowImpl* w, int mask, QRegion region,
             init();
         const QRect screenRect = Workspace::self()->clientArea(ScreenArea, w->screen(), w->desktop());
         // window geometry may not be bigger than screen geometry to fit into the FBO
-        if (m_shader && w->width() <= screenRect.width() && w->height() <= screenRect.height()) {
-            double left = 0;
-            double top = 0;
-            double right = w->width();
-            double bottom = w->height();
-            foreach (const WindowQuad & quad, data.quads) {
-                // we need this loop to include the decoration padding
-                left   = qMin(left, quad.left());
-                top    = qMin(top, quad.top());
-                right  = qMax(right, quad.right());
-                bottom = qMax(bottom, quad.bottom());
-            }
-            double width = right - left;
-            double height = bottom - top;
-            if (width > screenRect.width() || height > screenRect.height()) {
-                // window with padding does not fit into the framebuffer
-                // so cut of the shadow
-                left = 0;
-                top = 0;
-                width = w->width();
-                height = w->height();
-            }
+        QRect winGeo(w->expandedGeometry());
+        if (m_shader && winGeo.width() <= screenRect.width() && winGeo.height() <= screenRect.height()) {
+            winGeo.translate(-w->geometry().topLeft());
+            double left = winGeo.left();
+            double top = winGeo.top();
+            double width = winGeo.right() - left;
+            double height = winGeo.bottom() - top;
+
             int tx = data.xTranslation() + w->x() + left * data.xScale();
             int ty = data.yTranslation() + w->y() + top * data.yScale();
             int tw = width * data.xScale();