Description: use 128 as a reference DPI for small screens
Origin: upstream, https://code.qt.io/cgit/qt/qtbase.git/commit/?id=5e6bbbc1b86905c4
Last-Update: 2018-10-29

---
 src/plugins/platforms/xcb/qxcbscreen.cpp |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/src/plugins/platforms/xcb/qxcbscreen.cpp
+++ b/src/plugins/platforms/xcb/qxcbscreen.cpp
@@ -746,7 +746,11 @@ void QXcbScreen::updateGeometry(const QR
         m_sizeMillimeters = sizeInMillimeters(geometry.size(), m_virtualDesktop->dpi());
 
     qreal dpi = geometry.width() / physicalSize().width() * qreal(25.4);
-    m_pixelDensity = qMax(1, qRound(dpi/96));
+
+    // Use 128 as a reference DPI on small screens. This favors "small UI" over "large UI".
+    qreal referenceDpi = physicalSize().width() <= 320 ? 128 : 96;
+
+    m_pixelDensity = qMax(1, qRound(dpi/referenceDpi));
     m_geometry = geometry;
     m_availableGeometry = geometry & m_virtualDesktop->workArea();
     QWindowSystemInterface::handleScreenGeometryChange(QPlatformScreen::screen(), m_geometry, m_availableGeometry);