diff --git a/kded/serializer.h b/kded/serializer.h
--- a/kded/serializer.h
+++ b/kded/serializer.h
@@ -36,7 +36,6 @@
     static bool moveConfig(const QString &srcId, const QString &destId);
 
     static KScreen::OutputPtr findOutput(const KScreen::ConfigPtr &config, const QVariantMap &info);
-    static QString outputId(const KScreen::OutputPtr &output);
     static QVariantMap metadata(const KScreen::OutputPtr &output);
 
     static void setConfigPath(const QString &path);
diff --git a/kded/serializer.cpp b/kded/serializer.cpp
--- a/kded/serializer.cpp
+++ b/kded/serializer.cpp
@@ -57,25 +57,7 @@
     if (!config) {
         return QString();
     }
-    KScreen::OutputList outputs = config->outputs();
-
-    QStringList hashList;
-    //qCDebug(KSCREEN_KDED) << "Calculating config ID for" << currentConfig.data();
-    Q_FOREACH(const KScreen::OutputPtr &output, outputs) {
-        if (!output->isConnected()) {
-            continue;
-        }
-
-        //qCDebug(KSCREEN_KDED) << "\tPart of the Id: " << Serializer::outputId(output);
-        hashList.insert(0, Serializer::outputId(output));
-    }
-
-    qSort(hashList.begin(), hashList.end());
-
-    const QByteArray hash = QCryptographicHash::hash(hashList.join(QString()).toLatin1(),
-                                                     QCryptographicHash::Md5).toHex();
-    //qCDebug(KSCREEN_KDED) << "\tConfig ID:" << hash;
-    return QString::fromLatin1(hash);
+    return config->connectedOutputsHash();
 }
 
 bool Serializer::configExists(const KScreen::ConfigPtr &config)
@@ -155,7 +137,7 @@
 
         QVariantMap info;
 
-        info[QStringLiteral("id")] = Serializer::outputId(output);
+        info[QStringLiteral("id")] = output->hash();
         info[QStringLiteral("primary")] = output->isPrimary();
         info[QStringLiteral("enabled")] = output->isEnabled();
         info[QStringLiteral("rotation")] = output->rotation();
@@ -228,7 +210,7 @@
     QStringList allIds;
     allIds.reserve(outputs.count());
     Q_FOREACH (const KScreen::OutputPtr &output, outputs) {
-        const auto outputId = Serializer::outputId(output);
+        const auto outputId = output->hash();
         if (allIds.contains(outputId) && !duplicateIds.contains(outputId)) {
             duplicateIds << outputId;
         }
@@ -240,7 +222,7 @@
         if (!output->isConnected()) {
             continue;
         }
-        const auto outputId = Serializer::outputId(output);
+        const auto outputId = output->hash();
         if (outputId != info[QStringLiteral("id")].toString()) {
             continue;
         }
@@ -311,15 +293,6 @@
     return KScreen::OutputPtr();
 }
 
-QString Serializer::outputId(const KScreen::OutputPtr &output)
-{
-    if (output->edid() && output->edid()->isValid()) {
-        return output->edid()->hash();
-    }
-
-    return output->name();
-}
-
 QVariantMap Serializer::metadata(const KScreen::OutputPtr &output)
 {
     QVariantMap metadata;
diff --git a/tests/kded/serializertest.cpp b/tests/kded/serializertest.cpp
--- a/tests/kded/serializertest.cpp
+++ b/tests/kded/serializertest.cpp
@@ -365,7 +365,7 @@
     QCOMPARE(config->connectedOutputs().count(), 6);
     Q_FOREACH (auto output, config->connectedOutputs()) {
         QVERIFY(positions.keys().contains(output->name()));
-        QVERIFY(output->name() != Serializer::outputId(output));
+        QVERIFY(output->name() != output->hash());
         QCOMPARE(positions[output->name()], output->pos());
         QCOMPARE(output->currentMode()->size(), QSize(1920, 1080));
         QCOMPARE(output->currentMode()->refreshRate(), 60.0);