diff --git a/examples/quickcontrols2/flatstyle/main.cpp b/examples/quickcontrols2/flatstyle/main.cpp
index 93f856a906..ccc1249270 100644
--- a/examples/quickcontrols2/flatstyle/main.cpp
+++ b/examples/quickcontrols2/flatstyle/main.cpp
@@ -53,7 +53,6 @@
 
 int main(int argc, char *argv[])
 {
-    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QApplication app(argc, argv);
 
     QQmlApplicationEngine engine;
diff --git a/examples/quickcontrols2/imagine/automotive/automotive.cpp b/examples/quickcontrols2/imagine/automotive/automotive.cpp
index 63cc702d31..dc1d83e4e4 100644
--- a/examples/quickcontrols2/imagine/automotive/automotive.cpp
+++ b/examples/quickcontrols2/imagine/automotive/automotive.cpp
@@ -59,8 +59,6 @@ int main(int argc, char *argv[])
 {
     QGuiApplication::setApplicationName("Automotive");
     QGuiApplication::setOrganizationName("QtProject");
-    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-    QGuiApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
 
     QGuiApplication app(argc, argv);
 
diff --git a/examples/quickcontrols2/imagine/musicplayer/musicplayer.cpp b/examples/quickcontrols2/imagine/musicplayer/musicplayer.cpp
index a9fc2b9e29..bd125625b1 100644
--- a/examples/quickcontrols2/imagine/musicplayer/musicplayer.cpp
+++ b/examples/quickcontrols2/imagine/musicplayer/musicplayer.cpp
@@ -57,8 +57,6 @@ int main(int argc, char *argv[])
 {
     QGuiApplication::setApplicationName("Music Player");
     QGuiApplication::setOrganizationName("QtProject");
-    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-    QGuiApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
 
     QGuiApplication app(argc, argv);
 
diff --git a/examples/quickcontrols2/texteditor/texteditor.cpp b/examples/quickcontrols2/texteditor/texteditor.cpp
index e3d9ad79fd..040ca6d03f 100644
--- a/examples/quickcontrols2/texteditor/texteditor.cpp
+++ b/examples/quickcontrols2/texteditor/texteditor.cpp
@@ -66,7 +66,6 @@ int main(int argc, char *argv[])
 {
     QGuiApplication::setApplicationName("Text Editor");
     QGuiApplication::setOrganizationName("QtProject");
-    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 
 #ifdef QT_WIDGETS_LIB
     QApplication app(argc, argv);
diff --git a/examples/quickcontrols2/wearable/wearable.cpp b/examples/quickcontrols2/wearable/wearable.cpp
index 68dee7c0ff..a602eddc30 100644
--- a/examples/quickcontrols2/wearable/wearable.cpp
+++ b/examples/quickcontrols2/wearable/wearable.cpp
@@ -55,7 +55,6 @@
 
 int main(int argc, char *argv[])
 {
-    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QCoreApplication::setApplicationName("Wearable");
     QCoreApplication::setOrganizationName("QtProject");
 
diff --git a/src/imports/controls/doc/src/qtquickcontrols2-customize.qdoc b/src/imports/controls/doc/src/qtquickcontrols2-customize.qdoc
index 9b68607046..484cc5b2af 100644
--- a/src/imports/controls/doc/src/qtquickcontrols2-customize.qdoc
+++ b/src/imports/controls/doc/src/qtquickcontrols2-customize.qdoc
@@ -400,7 +400,6 @@
 
     int main(int argc, char *argv[])
     {
-        QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
         QGuiApplication app(argc, argv);
 
         qmlRegisterUncreatableType<MyStyle>("MyStyle", 1, 0, "MyStyle", "MyStyle is an attached property");
diff --git a/src/imports/controls/doc/src/qtquickcontrols2-gettingstarted.qdoc b/src/imports/controls/doc/src/qtquickcontrols2-gettingstarted.qdoc
index 22187bf416..377b55ed74 100644
--- a/src/imports/controls/doc/src/qtquickcontrols2-gettingstarted.qdoc
+++ b/src/imports/controls/doc/src/qtquickcontrols2-gettingstarted.qdoc
@@ -67,7 +67,6 @@
 
     int main(int argc, char *argv[])
     {
-        QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
         QGuiApplication app(argc, argv);
         QQmlApplicationEngine engine;
         engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
diff --git a/src/imports/platform/doc/src/includes/widgets.qdocinc b/src/imports/platform/doc/src/includes/widgets.qdocinc
index c89c3ca0aa..44ebba6de6 100644
--- a/src/imports/platform/doc/src/includes/widgets.qdocinc
+++ b/src/imports/platform/doc/src/includes/widgets.qdocinc
@@ -19,7 +19,6 @@ Create an instance of \l QApplication in \c main():
 
 int main(int argc, char *argv[])
 {
-    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QApplication app(argc, argv);
     QQmlApplicationEngine engine;
     engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
diff --git a/src/quickcontrols2/qquickstyle.cpp b/src/quickcontrols2/qquickstyle.cpp
index 2564a49b1d..fd81d1dd19 100644
--- a/src/quickcontrols2/qquickstyle.cpp
+++ b/src/quickcontrols2/qquickstyle.cpp
@@ -76,7 +76,6 @@ Q_LOGGING_CATEGORY(lcQtQuickControlsStyle, "qt.quick.controls.style")
 
     int main(int argc, char *argv[])
     {
-        QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
         QGuiApplication app(argc, argv);
 
         QQuickStyle::setStyle("Material");
diff --git a/tests/auto/qquickiconimage/tst_qquickiconimage.cpp b/tests/auto/qquickiconimage/tst_qquickiconimage.cpp
index bcf1231ffa..7dacda35de 100644
--- a/tests/auto/qquickiconimage/tst_qquickiconimage.cpp
+++ b/tests/auto/qquickiconimage/tst_qquickiconimage.cpp
@@ -561,7 +561,6 @@ void tst_qquickiconimage::translucentColors()
 
 int main(int argc, char *argv[])
 {
-    QGuiApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
     QGuiApplication app(argc, argv);
     Q_UNUSED(app);
     tst_qquickiconimage test;
diff --git a/tests/manual/buttons/buttons.cpp b/tests/manual/buttons/buttons.cpp
index 1e90930d69..0272522a50 100644
--- a/tests/manual/buttons/buttons.cpp
+++ b/tests/manual/buttons/buttons.cpp
@@ -52,7 +52,6 @@
 
 int main(int argc, char *argv[])
 {
-    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QGuiApplication app(argc, argv);
 
     QQmlApplicationEngine engine;
diff --git a/tests/manual/dialogs/dialogs.cpp b/tests/manual/dialogs/dialogs.cpp
index 73faa1759e..79d26c2b89 100644
--- a/tests/manual/dialogs/dialogs.cpp
+++ b/tests/manual/dialogs/dialogs.cpp
@@ -53,7 +53,6 @@
 
 int main(int argc, char *argv[])
 {
-    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QGuiApplication app(argc, argv);
 
     QQmlApplicationEngine engine;
diff --git a/tests/manual/headerview/main.cpp b/tests/manual/headerview/main.cpp
index b1573f081a..a11f862704 100644
--- a/tests/manual/headerview/main.cpp
+++ b/tests/manual/headerview/main.cpp
@@ -204,7 +204,6 @@ private:
 
 int main(int argc, char *argv[])
 {
-    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QGuiApplication app(argc, argv);
 
     qmlRegisterType<TestTableModel>("TestTableModel", 0, 1, "TestTableModel");
diff --git a/tests/manual/nativestyle/main.cpp b/tests/manual/nativestyle/main.cpp
index aee4324271..536625fb20 100644
--- a/tests/manual/nativestyle/main.cpp
+++ b/tests/manual/nativestyle/main.cpp
@@ -40,7 +40,6 @@
 
 int main(int argc, char *argv[])
 {
-    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QGuiApplication app(argc, argv);
 
     // Todo: rename the "default" style to e.g "simple"
diff --git a/tests/manual/testbench/main.cpp b/tests/manual/testbench/main.cpp
index 0584bd6d70..0ac446f4c6 100644
--- a/tests/manual/testbench/main.cpp
+++ b/tests/manual/testbench/main.cpp
@@ -65,7 +65,6 @@ int main(int argc, char *argv[])
 {
     QGuiApplication::setApplicationName("testbench");
     QGuiApplication::setOrganizationName("QtProject");
-    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 
     QGuiApplication app(argc, argv);