diff --git a/applets/systemmonitor/common/contents/ui/Applet.qml b/applets/systemmonitor/common/contents/ui/Applet.qml
--- a/applets/systemmonitor/common/contents/ui/Applet.qml
+++ b/applets/systemmonitor/common/contents/ui/Applet.qml
@@ -66,6 +66,18 @@
             "dataSource": smSource});
     }
 
+    function showSource(source) {
+        if (plasmoid.configuration.sources && plasmoid.configuration.sources.length > 0) {
+            return plasmoid.configuration.sources.indexOf(encodeURIComponent(source)) !== -1;
+        } else {
+            return sourceDefaultEnable(source);
+        }
+    }
+
+    function sourceDefaultEnable(source) {
+        return true;
+    }
+
     ListModel {
         id: sourcesModel
     }
@@ -82,11 +94,9 @@
         engine: "systemmonitor"
         interval: plasmoid.configuration.updateInterval
         onSourceAdded: {
-            if (plasmoid.configuration.sources && plasmoid.configuration.sources.length > 0 &&
-                plasmoid.configuration.sources.indexOf(encodeURIComponent(source)) === -1) {
-                return;
+            if (showSource(source)) {
+                rootItem.sourceAdded(source);
             }
-            rootItem.sourceAdded(source);
         }
         onSourceRemoved: {
             for (var i = sourcesModel.count - 1; i >= 0; --i) {
diff --git a/applets/systemmonitor/common/contents/ui/ConfigGeneral.qml b/applets/systemmonitor/common/contents/ui/ConfigGeneral.qml
--- a/applets/systemmonitor/common/contents/ui/ConfigGeneral.qml
+++ b/applets/systemmonitor/common/contents/ui/ConfigGeneral.qml
@@ -40,7 +40,7 @@
             for (var i in dataSourcesColumn.children) {
                 var child = dataSourcesColumn.children[i];
                 if (child.checked !== undefined) {
-                    child.checked = true;
+                    child.checked = sourceDefaultEnable(child.source);
                 }
             }
         } else {
@@ -53,6 +53,10 @@
         }
     }
 
+    function sourceDefaultEnable(source) {
+        return true;
+    }
+
     onCfg_sourcesChanged: {
         sourcesChanged();
     }
diff --git a/applets/systemmonitor/cpu/contents/ui/cpu.qml b/applets/systemmonitor/cpu/contents/ui/cpu.qml
--- a/applets/systemmonitor/cpu/contents/ui/cpu.qml
+++ b/applets/systemmonitor/cpu/contents/ui/cpu.qml
@@ -35,6 +35,10 @@
         }
     }
 
+    function sourceDefaultEnable(source) {
+        return source.match(/^cpu(\/|%2F)system(\/|%2F)TotalLoad/);
+    }
+
     delegate: SinglePlotter {
         autoRange: false
         rangeMin: 0
diff --git a/applets/systemmonitor/cpu/contents/ui/cpuConfig.qml b/applets/systemmonitor/cpu/contents/ui/cpuConfig.qml
--- a/applets/systemmonitor/cpu/contents/ui/cpuConfig.qml
+++ b/applets/systemmonitor/cpu/contents/ui/cpuConfig.qml
@@ -34,4 +34,8 @@
             root.addSource(source, match[1]);
         }
     }
+
+    function sourceDefaultEnable(source) {
+        return source.match(/^cpu(\/|%2F)system(\/|%2F)TotalLoad/);
+    }
 }