diff --git a/tests/auto/gui/kernel/qbackingstore/BLACKLIST b/tests/auto/gui/kernel/qbackingstore/BLACKLIST
new file mode 100644
index 0000000000..7b2c311d1f
--- /dev/null
+++ b/tests/auto/gui/kernel/qbackingstore/BLACKLIST
@@ -0,0 +1,9 @@
+# QTBUG-127920
+[flush:single-buffer:maximized]
+wayland ubuntu-24.04
+[flush:single-buffer:fullscreen]
+wayland ubuntu-24.04
+[flush:double-buffer:maximized]
+wayland ubuntu-24.04
+[flush:double-buffer:fullscreen]
+wayland ubuntu-24.04
diff --git a/tests/auto/gui/kernel/qbackingstore/tst_qbackingstore.cpp b/tests/auto/gui/kernel/qbackingstore/tst_qbackingstore.cpp
index a830d14be8..215a57fc3f 100644
--- a/tests/auto/gui/kernel/qbackingstore/tst_qbackingstore.cpp
+++ b/tests/auto/gui/kernel/qbackingstore/tst_qbackingstore.cpp
@@ -31,6 +31,7 @@ private slots:
     void scrollRectInImage();
 
     void scroll();
+    void flush_data();
     void flush();
 
     void staticContents();
@@ -267,11 +268,22 @@ private:
     QBackingStore backingStore;
 };
 
+void tst_QBackingStore::flush_data()
+{
+    QTest::addColumn<Qt::WindowState>("windowState");
+
+    QTest::newRow("normal") << Qt::WindowNoState;
+    QTest::newRow("maximized") << Qt::WindowMaximized;
+    QTest::newRow("fullscreen") << Qt::WindowFullScreen;
+}
+
 void tst_QBackingStore::flush()
 {
+    QFETCH(Qt::WindowState, windowState);
     Window window;
     window.setGeometry(20, 20, 200, 200);
-    window.showMaximized();
+    window.setWindowState(windowState);
+    window.setVisible(true);
 
     QTRY_VERIFY(window.isExposed());
 }