diff --git a/plugins/platforms/hwcomposer/egl_hwcomposer_backend.cpp b/plugins/platforms/hwcomposer/egl_hwcomposer_backend.cpp
--- a/plugins/platforms/hwcomposer/egl_hwcomposer_backend.cpp
+++ b/plugins/platforms/hwcomposer/egl_hwcomposer_backend.cpp
@@ -130,6 +130,10 @@
         qCWarning(KWIN_HWCOMPOSER) << "Error occurred while creating context " << error;
         return false;
     }
+
+    const QSize overall = m_backend->size();
+    glViewport(0, 0, overall.width(), overall.height());
+
     return true;
 }
 
diff --git a/plugins/platforms/hwcomposer/hwcomposer_backend.h b/plugins/platforms/hwcomposer/hwcomposer_backend.h
--- a/plugins/platforms/hwcomposer/hwcomposer_backend.h
+++ b/plugins/platforms/hwcomposer/hwcomposer_backend.h
@@ -80,11 +80,11 @@
     Outputs outputs() const override;
     Outputs enabledOutputs() const override;
 
-    QSize size() const {
-        return screenSize();
-    }
+    QSize size() const;
     QSize screenSize() const override;
 
+    int scale() const;
+
     HwcomposerWindow *createSurface();
 
     hwc_composer_device_1_t *device() const {
diff --git a/plugins/platforms/hwcomposer/hwcomposer_backend.cpp b/plugins/platforms/hwcomposer/hwcomposer_backend.cpp
--- a/plugins/platforms/hwcomposer/hwcomposer_backend.cpp
+++ b/plugins/platforms/hwcomposer/hwcomposer_backend.cpp
@@ -27,6 +27,8 @@
 #include "wayland_server.h"
 // KWayland
 #include <KWayland/Server/output_interface.h>
+// KDE
+#include <KConfigGroup>
 // Qt
 #include <QKeyEvent>
 #include <QDBusConnection>
@@ -253,14 +255,30 @@
     setReady(true);
 }
 
-QSize HwcomposerBackend::screenSize() const
+QSize HwcomposerBackend::size() const
 {
     if (m_output) {
         return m_output->pixelSize();
     }
     return QSize();
 }
 
+QSize HwcomposerBackend::screenSize() const
+{
+    if (m_output) {
+        return m_output->pixelSize() / m_output->scale();
+    }
+    return QSize();
+}
+
+int HwcomposerBackend::scale() const
+ {
+    if (m_output) {
+        return m_output->scale();
+    }
+    return 1;
+}
+
 void HwcomposerBackend::initLights()
 {
     hw_module_t *lightsModule = nullptr;
@@ -510,6 +528,9 @@
     setInternal(true);
     setEnabled(true);
     setDpmsSupported(true);
+
+    const auto outputGroup = kwinApp()->config()->group("HWComposerOutputs").group("0");
+    setScale(outputGroup.readEntry("Scale", 1));
     setWaylandMode(m_pixelSize, mode.refreshRate);
 }