diff --git a/src/tuxclocker-qt/Utils.cpp b/src/tuxclocker-qt/Utils.cpp
index fce7bea..81e23b3 100644
--- a/src/tuxclocker-qt/Utils.cpp
+++ b/src/tuxclocker-qt/Utils.cpp
@@ -3,6 +3,7 @@
 #include <AssignableProxy.hpp>
 #include <DeviceModel.hpp>
 #include <DeviceModelDelegate.hpp>
+#include <DynamicReadableConnectionData.hpp>
 #include <functional>
 #include <QDebug>
 #include <QSettings>
@@ -122,6 +123,12 @@ void writeAssignableDefaults(DeviceModel &model) {
 }
 
 void writeAssignableSetting(SettingsData data, AssignableSetting setting) {
+	qRegisterMetaType<DynamicReadableConnectionData>();
+
+	qRegisterMetaTypeStreamOperators<QVector<QPointF>>("QVector<QPointF>");
+	qRegisterMetaTypeStreamOperators<DynamicReadableConnectionData>(
+	    "DynamicReadableConnectionData");
+
 	if (!data.currentProfile.has_value())
 		return;
 
diff --git a/src/tuxclocker-qt/data/AssignableProxy.cpp b/src/tuxclocker-qt/data/AssignableProxy.cpp
index 24ac506..1145189 100644
--- a/src/tuxclocker-qt/data/AssignableProxy.cpp
+++ b/src/tuxclocker-qt/data/AssignableProxy.cpp
@@ -84,7 +84,11 @@ void AssignableProxy::apply() {
 			auto proxy = opt.value();
 			m_connection = new DynamicReadableConnection<uint>{*proxy, data};
 
+			// We use this to save succeeded parametrization data
+			// to settings, since keeping m_value around would affect the view
+			m_connectionValue = m_value;
 			startConnection();
+			m_signalConnectionSuccess = true;
 			m_value = QVariant();
 			return;
 		}
@@ -105,8 +109,13 @@ void AssignableProxy::startConnection() {
 		    auto err = doApply(targetValue);
 		    if (err.has_value())
 			    emit connectionValueChanged(err.value(), text);
-		    else
+		    else {
 			    emit connectionValueChanged(targetValue, text);
+			    if (m_signalConnectionSuccess) {
+				    emit connectionSucceeded(m_connectionValue);
+				    m_signalConnectionSuccess = false;
+			    }
+		    }
 	    });
 	// Emit started signal in case a connection emits a new value right away
 	emit connectionStarted();
diff --git a/src/tuxclocker-qt/data/AssignableProxy.hpp b/src/tuxclocker-qt/data/AssignableProxy.hpp
index 53b087f..e508826 100644
--- a/src/tuxclocker-qt/data/AssignableProxy.hpp
+++ b/src/tuxclocker-qt/data/AssignableProxy.hpp
@@ -29,14 +29,17 @@ signals:
 	void applied(std::optional<TC::Device::AssignmentError>);
 	void connectionValueChanged(
 	    std::variant<QVariant, TC::Device::AssignmentError>, QString text);
+	void connectionSucceeded(QVariant);
 	void connectionStarted();
 	void connectionStopped();
 private:
 	Q_OBJECT
 
 	QVariant m_value;
+	QVariant m_connectionValue;
 	QDBusInterface *m_iface;
 	DynamicReadableConnection<uint> *m_connection;
+	bool m_signalConnectionSuccess;
 
 	// This is a bit of a peril but not sure if we can store interfaces any better...
 	std::shared_ptr<AssignableConnection> m_assignableConnection;
diff --git a/src/tuxclocker-qt/data/DeviceModel.cpp b/src/tuxclocker-qt/data/DeviceModel.cpp
index 8ef5d56..0cdbeda 100644
--- a/src/tuxclocker-qt/data/DeviceModel.cpp
+++ b/src/tuxclocker-qt/data/DeviceModel.cpp
@@ -147,6 +147,17 @@ QStandardItem *DeviceModel::createAssignable(
 		    pattern(_) = [] {});
 	});
 
+	connect(proxy, &AssignableProxy::connectionSucceeded, [=](auto value) {
+		// Write successful connection value to settings
+		auto assSetting = AssignableSetting{
+		    .assignablePath = proxy->dbusPath(),
+		    .value = value,
+		};
+		auto newSettings =
+		    Settings::setAssignableSetting(Globals::g_settingsData, assSetting);
+		Utils::writeAssignableSetting(newSettings, assSetting);
+	});
+
 	QVariant pv;
 	pv.setValue(proxy);
 	ifaceItem->setData(pv, AssignableProxyRole);
diff --git a/src/tuxclocker-qt/data/DynamicReadableConnection.hpp b/src/tuxclocker-qt/data/DynamicReadableConnection.hpp
index 5751c2d..c6261d8 100644
--- a/src/tuxclocker-qt/data/DynamicReadableConnection.hpp
+++ b/src/tuxclocker-qt/data/DynamicReadableConnection.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "AssignableConnection.hpp"
+#include <DynamicReadableConnectionData.hpp>
 #include <DynamicReadableProxy.hpp>
 #include <fplus/fplus.hpp>
 #include <patterns.hpp>
@@ -17,23 +18,12 @@ using namespace fplus;
 using namespace mpark::patterns;
 using namespace TuxClocker::Device;
 
-struct DynamicReadableConnectionData {
-	// y = f(x)
-	QVector<QPointF> points;
-	// DBus path
-	QString dynamicReadablePath;
-	RangeInfo rangeInfo;
-};
-
 enum class TargetType {
 	IntType,
 	DoubleType
 };
 
-Q_DECLARE_METATYPE(DynamicReadableConnectionData)
-
-// TODO: make DynamicReadableProxy type parametrized so we can be sure to only get numeric values
-// from it Connection of an Assignable with a DynamicReadable
+// Connection of an Assignable with a DynamicReadable
 template <typename OutType> // Result of linear interpolation
 class DynamicReadableConnection : public AssignableConnection {
 public:
diff --git a/src/tuxclocker-qt/data/DynamicReadableConnectionData.cpp b/src/tuxclocker-qt/data/DynamicReadableConnectionData.cpp
new file mode 100644
index 0000000..3f65183
--- /dev/null
+++ b/src/tuxclocker-qt/data/DynamicReadableConnectionData.cpp
@@ -0,0 +1,49 @@
+#include "DynamicReadableConnectionData.hpp"
+
+#include <QDataStream>
+
+enum RangeType {
+	IntRange,
+	DoubleRange
+};
+
+QDataStream &operator<<(QDataStream &out, const TuxClocker::Device::RangeInfo &info) {
+	if (std::holds_alternative<TuxClocker::Device::Range<int>>(info)) {
+		auto intRange = std::get<TuxClocker::Device::Range<int>>(info);
+		out << IntRange << intRange.max << intRange.min;
+		return out;
+	}
+
+	if (std::holds_alternative<TuxClocker::Device::Range<double>>(info)) {
+		auto doubleRange = std::get<TuxClocker::Device::Range<double>>(info);
+		out << DoubleRange << doubleRange.max << doubleRange.min;
+		return out;
+	}
+	return out;
+}
+
+QDataStream &operator>>(QDataStream &in, TuxClocker::Device::RangeInfo &info) {
+	RangeType type;
+	in >> type;
+	if (type == IntRange) {
+		TuxClocker::Device::Range<int> intRange;
+		in >> intRange.max >> intRange.min;
+		return in;
+	}
+
+	if (type == DoubleRange) {
+		TuxClocker::Device::Range<double> doubleRange;
+		in >> doubleRange.max >> doubleRange.min;
+		return in;
+	}
+	return in;
+}
+
+QDataStream &operator<<(QDataStream &out, const DynamicReadableConnectionData &data) {
+	out << data.dynamicReadablePath << data.points << data.rangeInfo;
+	return out;
+}
+QDataStream &operator>>(QDataStream &in, DynamicReadableConnectionData &data) {
+	in >> data.dynamicReadablePath >> data.points >> data.rangeInfo;
+	return in;
+}
diff --git a/src/tuxclocker-qt/data/DynamicReadableConnectionData.hpp b/src/tuxclocker-qt/data/DynamicReadableConnectionData.hpp
new file mode 100644
index 0000000..de23e2e
--- /dev/null
+++ b/src/tuxclocker-qt/data/DynamicReadableConnectionData.hpp
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <Device.hpp>
+#include <QDataStream>
+#include <QMetaType>
+#include <QPointF>
+#include <QString>
+#include <QVector>
+
+struct DynamicReadableConnectionData {
+	// y = f(x)
+	QVector<QPointF> points;
+	// DBus path
+	QString dynamicReadablePath;
+	TuxClocker::Device::RangeInfo rangeInfo;
+
+	friend QDataStream &operator<<(QDataStream &, const DynamicReadableConnectionData &);
+	friend QDataStream &operator>>(QDataStream &, DynamicReadableConnectionData &);
+};
+Q_DECLARE_METATYPE(DynamicReadableConnectionData);
diff --git a/src/tuxclocker-qt/meson.build b/src/tuxclocker-qt/meson.build
index 9dee418..71274dd 100644
--- a/src/tuxclocker-qt/meson.build
+++ b/src/tuxclocker-qt/meson.build
@@ -24,6 +24,7 @@ sources = ['main.cpp',
 	'data/DeviceModel.cpp',
 	'data/DeviceModelDelegate.cpp',
 	'data/DeviceProxyModel.cpp',
+        'data/DynamicReadableConnectionData.cpp',
 	'data/DynamicReadableProxy.cpp',
 	'widgets/DeviceBrowser.cpp',
 	'widgets/DeviceTreeView.cpp',
diff --git a/src/tuxclocker-qt/widgets/Settings.cpp b/src/tuxclocker-qt/widgets/Settings.cpp
index 301ec20..f8bc168 100644
--- a/src/tuxclocker-qt/widgets/Settings.cpp
+++ b/src/tuxclocker-qt/widgets/Settings.cpp
@@ -1,5 +1,6 @@
 #include "Settings.hpp"
 
+#include <DynamicReadableConnectionData.hpp>
 #include <Globals.hpp>
 #include <QCheckBox>
 #include <QGridLayout>
@@ -174,6 +175,9 @@ QVector<AssignableSetting> Settings::readAssignableSettings(QString profile) {
 
 SettingsData Settings::readSettings() {
 	qRegisterMetaTypeStreamOperators<QVector<QString>>("QVector<QString>>");
+	qRegisterMetaTypeStreamOperators<QVector<QPointF>>("QVector<QPointF>");
+	qRegisterMetaTypeStreamOperators<DynamicReadableConnectionData>(
+	    "DynamicReadableConnectionData");
 	QSettings s{"tuxclocker"};
 
 	std::optional<QString> profile;