diff --git a/abstract_output.h b/abstract_output.h
--- a/abstract_output.h
+++ b/abstract_output.h
@@ -171,6 +171,8 @@
 
     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
@@ -59,10 +59,7 @@
 
 QSize AbstractOutput::physicalSize() const
 {
-    if (m_orientation == Qt::PortraitOrientation || m_orientation == Qt::InvertedPortraitOrientation) {
-        return m_physicalSize.transposed();
-    }
-    return m_physicalSize;
+    return orientateSize(m_physicalSize);
 }
 
 int AbstractOutput::refreshRate() const
@@ -251,4 +248,12 @@
     m_waylandOutputDevice->create();
 }
 
+QSize AbstractOutput::orientateSize(const QSize &size) const
+{
+    if (m_orientation == Qt::PortraitOrientation || m_orientation == Qt::InvertedPortraitOrientation) {
+        return size.transposed();
+    }
+    return size;
+}
+
 }
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
@@ -783,11 +783,7 @@
 
 QSize DrmOutput::pixelSize() const
 {
-    auto orient = orientation();
-    if (orient == Qt::PortraitOrientation || orient == Qt::InvertedPortraitOrientation) {
-        return QSize(m_mode.vdisplay, m_mode.hdisplay);
-    }
-    return QSize(m_mode.hdisplay, m_mode.vdisplay);
+    return orientateSize(QSize(m_mode.hdisplay, m_mode.vdisplay));
 }
 
 void DrmOutput::setWaylandMode()