diff --git a/src/config.h b/src/config.h
--- a/src/config.h
+++ b/src/config.h
@@ -115,6 +115,18 @@
      */
     ConfigPtr clone() const;
 
+    /**
+     * Returns an identifying hash for this config in regards to its
+     * connected outputs.
+     *
+     * The hash is calculated with a sorted combination of all
+     * connected output hashes.
+     *
+     * @return sorted hash combination of all connected outputs
+     * @since 5.15
+     */
+    QString connectedOutputsHash() const;
+
     ScreenPtr screen() const;
     void setScreen(const ScreenPtr &screen);
 
diff --git a/src/config.cpp b/src/config.cpp
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -25,6 +25,8 @@
 
 #include <QDebug>
 #include <QRect>
+#include <QStringList>
+#include <QCryptographicHash>
 
 using namespace KScreen;
 
@@ -219,6 +221,19 @@
     return newConfig;
 }
 
+QString Config::connectedOutputsHash() const
+{
+    QStringList hashedOutputs;
+
+    const auto outputs = connectedOutputs();
+    for (const OutputPtr &output : outputs) {
+        hashedOutputs << output->hash();
+    }
+    std::sort(hashedOutputs.begin(), hashedOutputs.end());
+    const auto hash = QCryptographicHash::hash(hashedOutputs.join(QString()).toLatin1(),
+                                               QCryptographicHash::Md5);
+    return QString::fromLatin1(hash.toHex());
+}
 
 ScreenPtr Config::screen() const
 {
diff --git a/src/output.h b/src/output.h
--- a/src/output.h
+++ b/src/output.h
@@ -98,6 +98,17 @@
         QString name() const;
         void setName(const QString& name);
 
+        /**
+         * Returns an identifying hash for this output.
+         *
+         * The hash is calculated either via the edid hash or if no
+         * edid is available by the output name.
+         *
+         * @return identifying hash of this output
+         * @since 5.15
+         */
+        QString hash() const;
+
         Type type() const;
         void setType(Type type);
 
diff --git a/src/output.cpp b/src/output.cpp
--- a/src/output.cpp
+++ b/src/output.cpp
@@ -210,6 +210,14 @@
     Q_EMIT outputChanged();
 }
 
+QString Output::hash() const
+{
+    if (edid() && edid()->isValid()) {
+        return edid()->hash();
+    }
+    return name();
+}
+
 Output::Type Output::type() const
 {
     return d->type;