idle_x11

diff --git a/src/libpsi/tools/idle/idle_x11.cpp b/src/libpsi/tools/idle/idle_x11.cpp
index 578bcbb1..4fff6803 100644
--- a/src/libpsi/tools/idle/idle_x11.cpp
+++ b/src/libpsi/tools/idle/idle_x11.cpp
@@ -19,20 +19,78 @@

 #include "idle.h"

-#ifndef HAVE_XSS
+#if !defined(HAVE_XSS) && !defined(USE_DBUS)

 IdlePlatform::IdlePlatform() { d = nullptr; }
 IdlePlatform::~IdlePlatform() { }
 bool IdlePlatform::init() { return false; }
 int  IdlePlatform::secondsIdle() { return 0; }

-#else
+#elif defined(USE_DBUS) && (!defined(HAVE_X11) || !defined(LIMIT_X11_USAGE))

+#include <QDBusConnection>
+#include <QDBusConnectionInterface>
+#include <QDBusInterface>
+#include <QDBusMessage>
+#include <QDBusReply>
+
+// Screen Saver dbus services
+static const QLatin1String COMMON_SS_SERV("org.freedesktop.ScreenSaver");
+static const QLatin1String COMMON_SS_PATH("/ScreenSaver");
+static const QLatin1String KDE_SS_SERV("org.kde.screensaver");
+static const QLatin1String GNOME_SS_SERV("org.gnome.Mutter.IdleMonitor");
+static const QLatin1String GNOME_SS_PATH("/org/gnome/Mutter/IdleMonitor/Core");
+// Screen saver functions
+static const QLatin1String GNOME_SS_F("GetIdletime");
+static const QLatin1String COMMON_SS_F("GetSessionIdleTime");
+
+class IdlePlatform::Private {
+public:
+    Private() { }
+    QString availableService;
+    bool    getServicesAvailable()
+    {
+        const auto        services     = QDBusConnection::sessionBus().interface()->registeredServiceNames().value();
+        const QStringList idleServices = { KDE_SS_SERV, GNOME_SS_SERV };
+        // find first available dbus-service
+        for (const auto &service : idleServices) {
+            if (services.contains(service)) {
+                availableService = service;
+                return true;
+            }
+        }
+        return false;
+    }
+};
+
+IdlePlatform::IdlePlatform() { d = new Private; }
+IdlePlatform::~IdlePlatform() { delete d; }
+bool IdlePlatform::init() { return !d->getServicesAvailable(); }
+
+int IdlePlatform::secondsIdle()
+{
+    // KDE and freedesktop uses the same path interface and method but gnome uses other
+    bool                isNotGnome = d->availableService == COMMON_SS_SERV || d->availableService == KDE_SS_SERV;
+    const QLatin1String iface      = isNotGnome ? COMMON_SS_SERV : GNOME_SS_SERV;
+    const QLatin1String path       = isNotGnome ? COMMON_SS_PATH : GNOME_SS_PATH;
+    const QLatin1String method     = isNotGnome ? COMMON_SS_F : GNOME_SS_F;
+    auto                interface  = QDBusInterface(d->availableService, path, iface);
+    if (interface.isValid()) {
+        QDBusReply<int> reply = interface.call(method);
+        // probably reply value for freedesktop and kde need to be converted to seconds
+        if (reply.isValid())
+            return isNotGnome ? reply.value() / 1000 : reply.value();
+    }
+    return 0;
+}
+
+#else
+
 #include <QApplication>
 #include <QDesktopWidget>
 #include <QX11Info>