diff --git a/abstract_output.h b/abstract_output.h
--- a/abstract_output.h
+++ b/abstract_output.h
@@ -117,6 +117,8 @@
         return false;
     }
 
+    QSize orientateSize(const QSize &size) const;
+
 Q_SIGNALS:
     void modeChanged();
 
@@ -171,8 +173,6 @@
 
     void setWaylandMode(const QSize &size, int refreshRate);
 
-    QSize orientateSize(const QSize &size) const;
-
 private:
     QPointer<KWayland::Server::OutputInterface> m_waylandOutput;
     QPointer<KWayland::Server::XdgOutputInterface> m_xdgOutput;
diff --git a/abstract_output.cpp b/abstract_output.cpp
--- a/abstract_output.cpp
+++ b/abstract_output.cpp
@@ -54,7 +54,7 @@
 
 QRect AbstractOutput::geometry() const
 {
-    return QRect(m_globalPos, pixelSize() / scale());
+    return QRect(m_globalPos, orientateSize(pixelSize()) / scale());
 }
 
 QSize AbstractOutput::physicalSize() const
@@ -101,7 +101,7 @@
         m_waylandOutputDevice->setScaleF(scale);
     }
     if (m_xdgOutput) {
-        m_xdgOutput->setLogicalSize(pixelSize() / m_scale);
+        m_xdgOutput->setLogicalSize(orientateSize(pixelSize()) / m_scale);
         m_xdgOutput->done();
     }
     emit modeChanged();
@@ -160,7 +160,7 @@
     }
     m_waylandOutput->setCurrentMode(size, refreshRate);
     if (m_xdgOutput) {
-        m_xdgOutput->setLogicalSize(pixelSize() / scale());
+        m_xdgOutput->setLogicalSize(orientateSize(pixelSize()) / scale());
         m_xdgOutput->done();
     }
 }
diff --git a/plugins/platforms/drm/drm_output.cpp b/plugins/platforms/drm/drm_output.cpp
--- a/plugins/platforms/drm/drm_output.cpp
+++ b/plugins/platforms/drm/drm_output.cpp
@@ -783,7 +783,7 @@
 
 QSize DrmOutput::pixelSize() const
 {
-    return orientateSize(QSize(m_mode.hdisplay, m_mode.vdisplay));
+    return QSize(m_mode.hdisplay, m_mode.vdisplay);
 }
 
 void DrmOutput::setWaylandMode()
@@ -898,7 +898,7 @@
         // go back to previous state
         if (m_lastWorkingState.valid) {
             m_mode = m_lastWorkingState.mode;
-            setOrientation(m_lastWorkingState.orientation);
+            //setOrientation(m_lastWorkingState.orientation);
             setGlobalPos(m_lastWorkingState.globalPos);
             if (m_primaryPlane) {
                 m_primaryPlane->setTransformation(m_lastWorkingState.planeTransformations);
diff --git a/plugins/platforms/drm/egl_gbm_backend.cpp b/plugins/platforms/drm/egl_gbm_backend.cpp
--- a/plugins/platforms/drm/egl_gbm_backend.cpp
+++ b/plugins/platforms/drm/egl_gbm_backend.cpp
@@ -232,14 +232,15 @@
         return false;
     }
     // TODO: ensure the viewport is set correctly each time
-    const QSize &overall = screens()->size();
+    const QSize &overall = output.output->orientateSize(screens()->size());
     const QRect &v = output.output->geometry();
     // TODO: are the values correct?
 
     qreal scale = output.output->scale();
 
     glViewport(-v.x() * scale, (v.height() - overall.height() + v.y()) * scale,
                overall.width() * scale, overall.height() * scale);
+    glRotatef(90, 0,0,-1);
     return true;
 }
 
diff --git a/plugins/scenes/opengl/scene_opengl.cpp b/plugins/scenes/opengl/scene_opengl.cpp
--- a/plugins/scenes/opengl/scene_opengl.cpp
+++ b/plugins/scenes/opengl/scene_opengl.cpp
@@ -976,6 +976,7 @@
 
     QMatrix4x4 projection;
     projection.frustum(xMin, xMax, yMin, yMax, zNear, zFar);
+//     projection.rotate(90, 0,0,-1);
 
     // Create a second matrix that transforms screen coordinates
     // to world coordinates.