diff --git a/src/kcmodule.h b/src/kcmodule.h
--- a/src/kcmodule.h
+++ b/src/kcmodule.h
@@ -359,6 +359,18 @@
      */
     void changed(bool state);
 
+    /**
+     * Indicate that the state of the modules contents matches the default
+     * settings.
+     *
+     * This signal is emitted whenever the state of the configuration
+     * shown in the module changes. It allows the module container to
+     * keep track of defaults.
+     *
+     * @since 5.65
+     */
+    void defaulted(bool state);
+
     /**
      * Indicate that the module's quickhelp has changed.
      *
@@ -453,12 +465,27 @@
      */
     bool managedWidgetChangeState() const;
 
+    /**
+     * Returns the defaulted state of automatically managed widgets in this dialog
+     *
+     * @since 5.65
+     */
+    bool managedWidgetDefaultState() const;
+
     /**
      * Call this method when your manually managed widgets change state between
      * changed and not changed
      */
     void unmanagedWidgetChangeState(bool);
 
+    /**
+     * Call this method when your manually managed widgets change state between
+     * defaulted and not defaulted
+     *
+     * @since 5.65
+     */
+    void unmanagedWidgetDefaultState(bool);
+
 private:
     KCModulePrivate *const d;
 };
diff --git a/src/kcmodule.cpp b/src/kcmodule.cpp
--- a/src/kcmodule.cpp
+++ b/src/kcmodule.cpp
@@ -43,7 +43,9 @@
         _useRootOnlyMessage(false),
         _firstshow(true),
         _needsAuthorization(false),
-        _unmanagedWidgetChangeState(false)
+        _unmanagedWidgetChangeState(false),
+        _unmanagedWidgetDefaultState(false),
+        _unmanagedWidgetDefaultStateCalled(false)
     { }
 
     void authStatusChanged(int status);
@@ -69,6 +71,8 @@
     // widgets to coexist peacefully and do the correct thing with
     // the changed(bool) signal
     bool _unmanagedWidgetChangeState : 1;
+    bool _unmanagedWidgetDefaultState : 1;
+    bool _unmanagedWidgetDefaultStateCalled : 1;
 };
 
 KCModule::KCModule(const KAboutData *aboutData, QWidget *parent, const QVariantList &)
@@ -194,7 +198,7 @@
     for (KConfigDialogManager *manager : qAsConst(d->managers)) {
         manager->updateWidgets();
     }
-    emit changed(false);
+    widgetChanged();
 }
 
 void KCModule::save()
@@ -215,6 +219,11 @@
 void KCModule::widgetChanged()
 {
     emit changed(d->_unmanagedWidgetChangeState || managedWidgetChangeState());
+    if (d->_unmanagedWidgetDefaultStateCalled) {
+        emit defaulted(d->_unmanagedWidgetDefaultState && managedWidgetDefaultState());
+    } else {
+        emit defaulted(!d->managers.isEmpty() && managedWidgetDefaultState());
+    }
 }
 
 bool KCModule::managedWidgetChangeState() const
@@ -228,12 +237,30 @@
     return false;
 }
 
+bool KCModule::managedWidgetDefaultState() const
+{
+    for (KConfigDialogManager *manager : qAsConst(d->managers)) {
+        if (!manager->isDefault()) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
 void KCModule::unmanagedWidgetChangeState(bool changed)
 {
     d->_unmanagedWidgetChangeState = changed;
     widgetChanged();
 }
 
+void KCModule::unmanagedWidgetDefaultState(bool defaulted)
+{
+    d->_unmanagedWidgetDefaultStateCalled = true;
+    d->_unmanagedWidgetDefaultState = defaulted;
+    widgetChanged();
+}
+
 const KAboutData *KCModule::aboutData() const
 {
     return d->_about;