diff --git a/kded/daemon.cpp b/kded/daemon.cpp
--- a/kded/daemon.cpp
+++ b/kded/daemon.cpp
@@ -140,6 +140,9 @@
 {
     qCDebug(KSCREEN_KDED) << "doApplyConfig()";
     setMonitorForChanges(false);
+    KScreen::ConfigMonitor::instance()->removeConfig(m_monitoredConfig);
+    m_monitoredConfig = config;
+    KScreen::ConfigMonitor::instance()->addConfig(m_monitoredConfig);
 
     connect(new KScreen::SetConfigOperation(config), &KScreen::SetConfigOperation::finished, this,
             [&]() {
diff --git a/kded/serializer.cpp b/kded/serializer.cpp
--- a/kded/serializer.cpp
+++ b/kded/serializer.cpp
@@ -154,6 +154,7 @@
         info[QStringLiteral("primary")] = output->isPrimary();
         info[QStringLiteral("enabled")] = output->isEnabled();
         info[QStringLiteral("rotation")] = output->rotation();
+        info[QStringLiteral("scale")] = output->scale();
 
         QVariantMap pos;
         pos[QStringLiteral("x")] = output->pos().x();