diff --git a/cd_utils/cdutils_core.cpp b/cd_utils/cdutils_core.cpp
index ae106b8..9c95baa 100644
--- a/cd_utils/cdutils_core.cpp
+++ b/cd_utils/cdutils_core.cpp
@@ -217,6 +217,12 @@ void CDCore::stop() {
 }
 
 
+void CDCore::release() {
+	stop();
+	connection.removeAllDevices();
+}
+
+
 void CDCore::startX(double freq) {
 	//piCout << "start x" << x_timer.isRunning() << freq;
 	if (!x_timer.isRunning())
@@ -225,7 +231,7 @@ void CDCore::startX(double freq) {
 
 
 void CDCore::stopX() {
-	x_timer.stop();
+	x_timer.stop(true);
 }
 
 
diff --git a/cd_utils/cdutils_core.h b/cd_utils/cdutils_core.h
index 3fe45d6..cf5040a 100644
--- a/cd_utils/cdutils_core.h
+++ b/cd_utils/cdutils_core.h
@@ -63,6 +63,7 @@ public:
 	void initPult();
 	void init(const PIString & configuration, bool pult = false);
 	void stop();
+	void release();
 	void startX(double freq = 20.);
 	void stopX();
 	void sendCommand(const CDType & c);
diff --git a/cd_utils/cdutils_interface.cpp b/cd_utils/cdutils_interface.cpp
index f976772..e5c90ba 100644
--- a/cd_utils/cdutils_interface.cpp
+++ b/cd_utils/cdutils_interface.cpp
@@ -125,11 +125,16 @@ bool Interface::configure(const PIString & config) {
 }
 
 
-void Interface::reinitConnection(const PIString &configuration) {
+void Interface::reinitConnection(const PIString & configuration) {
 	core->init(configuration);
 }
 
 
+void Interface::releaseConnection() {
+	core->release();
+}
+
+
 void Interface::write(PIIODevice * d) {
 	core->cd_write(s, d);
 }
diff --git a/cd_utils/cdutils_interface.h b/cd_utils/cdutils_interface.h
index 0ad710a..c6e166c 100644
--- a/cd_utils/cdutils_interface.h
+++ b/cd_utils/cdutils_interface.h
@@ -37,6 +37,7 @@ public:
 	void setFileName(const PIString & _file);
 	bool configure(const PIString & config);
 	void reinitConnection(const PIString & configuration);
+	void releaseConnection();
 	void write(PIIODevice * d);
 	void read(PIIODevice * d);
 	void parse(PIIODevice * d);
diff --git a/qad/utils/qad_types.cpp b/qad/utils/qad_types.cpp
index c09805e..7c508cd 100644
--- a/qad/utils/qad_types.cpp
+++ b/qad/utils/qad_types.cpp
@@ -139,3 +139,8 @@ QSize preferredIconSize(float x) {
 	int s = qMax<int>(8, qRound(fontHeight() * x));
 	return QSize(s, s);
 }
+
+
+double appScale() {
+	return qMax<double>(fontHeight() / 15., 1.);
+}
diff --git a/qad/utils/qad_types.h b/qad/utils/qad_types.h
index b909b07..867cebe 100644
--- a/qad/utils/qad_types.h
+++ b/qad/utils/qad_types.h
@@ -120,6 +120,7 @@ QString uniqueName(QString n, const QStringList & names);
 int fontHeight();
 int lineThickness();
 QSize preferredIconSize(float x = 1.f);
+double appScale();
 
 
 #endif // QAD_TYPES_H