Index: effects/blur/blur.cpp
===================================================================
--- effects/blur/blur.cpp
+++ effects/blur/blur.cpp
@@ -464,6 +464,10 @@
             if (w->isFullScreen() && GLRenderTarget::blitSupported() && m_simpleShader->isValid()
                     && !GLPlatform::instance()->supports(LimitedNPOT) && shape.boundingRect() == w->geometry()) {
                 doSimpleBlur(w, data.opacity(), data.screenProjectionMatrix());
+            } else if (GLRenderTarget::virtualScreenScale() > 1.0) {
+                if (GLRenderTarget::blitSupported()) {
+                    doBlur(shape, screen, data.opacity(), data.screenProjectionMatrix());
+                }
             } else if (m_shouldCache && !translated && !w->isDeleted()) {
                 doCachedBlur(w, region, data.opacity(), data.screenProjectionMatrix());
             } else {
@@ -529,9 +533,15 @@
     scratch.setWrapMode(GL_CLAMP_TO_EDGE);
     scratch.bind();
 
-    const QRect sg = GLRenderTarget::virtualScreenGeometry();
-    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, r.x() - sg.x(), sg.height() - sg.y() - r.y() - r.height(),
-                        r.width(), r.height());
+    //if the framebuffer is scaled, blit to downsample everything into standard resolution
+    if (GLRenderTarget::virtualScreenScale() > 1.0) {
+        target->attachTexture(scratch);
+        target->blitFromFramebuffer(r, QRect(0, 0, r.width(), r.height()));
+    } else {
+        const QRect sg = GLRenderTarget::virtualScreenGeometry();
+        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, (r.x() - sg.x()), (sg.height() - sg.y() - r.y() - r.height()),
+                            scratch.width(), scratch.height());
+    }
 
     // Draw the texture on the offscreen framebuffer object, while blurring it horizontally
     target->attachTexture(tex);