diff --git a/src/corelib/global/archdetect.cpp b/src/corelib/global/archdetect.cpp
index 1d00b7f5..8ca6efef 100644
--- a/src/corelib/global/archdetect.cpp
+++ b/src/corelib/global/archdetect.cpp
@@ -59,6 +59,10 @@
 #  define ARCH_PROCESSOR "x86_64"
 #elif defined(Q_PROCESSOR_IA64)
 #  define ARCH_PROCESSOR "ia64"
+#elif defined(Q_PROCESSOR_LOONGARCH_64)
+#  define ARCH_PROCESSOR "loongarch64"
+#elif defined(Q_PROCESSOR_LOONGARCH)
+#  define ARCH_PROCESSOR "loongarch"
 #elif defined(Q_PROCESSOR_MIPS_64)
 #  define ARCH_PROCESSOR "mips64"
 #elif defined(Q_PROCESSOR_MIPS)
diff --git a/src/corelib/global/qprocessordetection.h b/src/corelib/global/qprocessordetection.h
index a6ead549..2a0382c7 100644
--- a/src/corelib/global/qprocessordetection.h
+++ b/src/corelib/global/qprocessordetection.h
@@ -228,6 +228,13 @@
 #  define Q_PROCESSOR_WORDSIZE   8
 // Q_BYTE_ORDER not defined, use endianness auto-detection
 
+#elif defined(_loongarch) || defined(__loongarch__)
+#  define Q_PROCESSOR_LOONGARCH
+#  if defined(__loongarch64)
+#    define Q_PROCESSOR_LOONGARCH_64
+#    define Q_PROCESSOR_WORDSIZE 8
+#  endif
+
 /*
     MIPS family, known revisions: I, II, III, IV, 32, 64
 
diff --git a/src/gui/kernel/qhighdpiscaling.cpp b/src/gui/kernel/qhighdpiscaling.cpp
index 9bbf2773..dfe0ee98 100644
--- a/src/gui/kernel/qhighdpiscaling.cpp
+++ b/src/gui/kernel/qhighdpiscaling.cpp
@@ -396,10 +396,7 @@ qreal QHighDpiScaling::roundScaleFactor(qreal rawFactor)
         }
 
         // Check application object if no environment value was set.
-        if (scaleFactorRoundingPolicy == Qt::HighDpiScaleFactorRoundingPolicy::Unset) {
-            scaleFactorRoundingPolicy = QGuiApplication::highDpiScaleFactorRoundingPolicy();
-        } else {
-            // Make application setting reflect environment
+        if (scaleFactorRoundingPolicy != Qt::HighDpiScaleFactorRoundingPolicy::Unset) {
             QGuiApplication::setHighDpiScaleFactorRoundingPolicy(scaleFactorRoundingPolicy);
         }
     }
@@ -460,8 +457,6 @@ QDpi QHighDpiScaling::effectiveLogicalDpi(const QPlatformScreen *screen, qreal r
                          policyText.constData(), values.constData());
             }
         }
-        if (dpiAdjustmentPolicy == DpiAdjustmentPolicy::Unset)
-            dpiAdjustmentPolicy = DpiAdjustmentPolicy::UpOnly;
     }
 
     // Apply adjustment policy.
@@ -539,7 +534,7 @@ void QHighDpiScaling::updateHighDpiScaling()
             ++i;
         }
     }
-    m_active = m_globalScalingActive || m_screenFactorSet || m_pixelDensityScalingActive;
+    m_active = m_globalScalingActive || m_usePixelDensity;
 }
 
 /*
@@ -684,9 +679,7 @@ QDpi QHighDpiScaling::logicalDpi(const QScreen *screen)
         return QDpi(96, 96);
 
     if (!m_usePixelDensity) {
-        const qreal screenScaleFactor = screenSubfactor(screen->handle());
-        const QDpi dpi = QPlatformScreen::overrideDpi(screen->handle()->logicalDpi());
-        return QDpi{ dpi.first / screenScaleFactor, dpi.second / screenScaleFactor };
+        return screen->handle()->logicalDpi();
     }
 
     const qreal scaleFactor = rawScaleFactor(screen->handle());
diff --git a/src/gui/kernel/qhighdpiscaling_p.h b/src/gui/kernel/qhighdpiscaling_p.h
index 5b02c5d6..e4714c99 100644
--- a/src/gui/kernel/qhighdpiscaling_p.h
+++ b/src/gui/kernel/qhighdpiscaling_p.h
@@ -159,12 +159,12 @@ inline QVector2D scale(const QVector2D &value, qreal scaleFactor, QPointF /* ori
 
 inline QPointF scale(const QPointF &pos, qreal scaleFactor, QPointF origin = QPointF(0, 0))
 {
-     return (pos - origin) * scaleFactor + origin;
+     return (pos - origin) * scaleFactor + origin * scaleFactor;
 }
 
 inline QPoint scale(const QPoint &pos, qreal scaleFactor, QPoint origin = QPoint(0, 0))
 {
-     return (pos - origin) * scaleFactor + origin;
+     return (pos - origin) * scaleFactor + origin * scaleFactor;
 }
 
 inline QRect scale(const QRect &rect, qreal scaleFactor, QPoint origin = QPoint(0, 0))
diff --git a/src/gui/kernel/qscreen.cpp b/src/gui/kernel/qscreen.cpp
index 8e0eb351..3bceaf2e 100644
--- a/src/gui/kernel/qscreen.cpp
+++ b/src/gui/kernel/qscreen.cpp
@@ -410,6 +410,12 @@ QSize QScreen::availableSize() const
 QRect QScreen::geometry() const
 {
     Q_D(const QScreen);
+
+	if (d->platformScreen)
+	{
+    	return QHighDpi::fromNativePixels(d->platformScreen->geometry(), this);
+	}
+
     return d->geometry;
 }
 
diff --git a/src/gui/painting/qtransform.cpp b/src/gui/painting/qtransform.cpp
index e86aff1c..9d281f66 100644
--- a/src/gui/painting/qtransform.cpp
+++ b/src/gui/painting/qtransform.cpp
@@ -1568,7 +1568,7 @@ QRegion QTransform::map(const QRegion &r) const
     }
 
     QPainterPath p = map(qt_regionToPath(r));
-    return p.toFillPolygon(QTransform()).toPolygon();
+    return p.toFillPolygon().toPolygon();
 }
 
 struct QHomogeneousCoordinate