QGamepad and QGamepadManager doesn't detect the disconnection of a gamepad

Dear guy's,

I am running my software in ubuntu 16.04

I am using QGamepad and QGamepadManager for get the state of the joysticks & button of a gamepad and it works well: http://doc.qt.io/qt-5/qgamepad.html

But i have some troubles for detect the disconnection of the gamepad:

• With QGamepad: if i remove the gamepad, "m_gamepad->isConnected()" still have the "true" value
• With QGamepad: The event connectedChanged is never trigered when i disconnect the gamepad
• With QGamepadManager: The event QGamepadManager::connectedGamepadsChanged is never trigered when i connect/disconnect a gamepad
• With QGamepadManager: The event QGamepadManager::gamepadConnected is never trigered when i connect/disconnect a gamepad
• With QGamepadManager: The event QGamepadManager::gamepadDisconnected is never trigered when i connect/disconnect a gamepad
• With QGamepad or QGamepadManager: When my gamepad is disconnected I see this message in the console "Gamepad: Could not read from input device (Aucun périphérique de ce type)",

Other events of QGamepadManager and QGamepad works well.

The problem is for detect the "disconnection" of a gamepad.

Maybe QGamepad use an external software/tool/lib, and when a gamepad is disconnected, this tool is stoped. Because if i disconnect and reconnect the gamepad, with QGamepadManager I will no more get the axis and button events (QGamepadManager events are triggered for all gamepads, so not just one)

You can reproduce it with this code:
QT += gamepad

#include <QtGamepad/QGamepad>

connect(QGamepadManager::instance(), &QGamepadManager::connectedGamepadsChanged, this,[]()

{ qDebug() << "connected gamepads changed:"; }

);
connect(QGamepadManager::instance(), &QGamepadManager::gamepadConnected, this,[](int deviceId)

{ qDebug() << "gamepad connected:" << deviceId; }

);
connect(QGamepadManager::instance(), &QGamepadManager::gamepadDisconnected, this,[](int deviceId)

{ qDebug() << "gamepad disconnected:" << deviceId; }

);
connect(QGamepadManager::instance(), &QGamepadManager::gamepadButtonPressEvent, this,[](int deviceId, QGamepadManager::GamepadButton button, double value)

{ qDebug() << "button press event:" << deviceId << button << value; }

);
connect(QGamepadManager::instance(), &QGamepadManager::gamepadButtonReleaseEvent, this,[](int deviceId, QGamepadManager::GamepadButton button)

{ qDebug() << "button release event:" << deviceId << button; }

);
connect(QGamepadManager::instance(), &QGamepadManager::gamepadAxisEvent, this,[](int deviceId, QGamepadManager::GamepadAxis axis, double value)

{ qDebug() << "axis event:" << deviceId << axis << value; }

);
connect(QGamepadManager::instance(), &QGamepadManager::buttonConfigured, this,[](int deviceId, QGamepadManager::GamepadButton button)

{ qDebug() << "button configured:" << deviceId << button; }

);
connect(QGamepadManager::instance(), &QGamepadManager::axisConfigured, this,[](int deviceId, QGamepadManager::GamepadAxis axis)

{ qDebug() << "axis configured:" << deviceId << axis; }

);
connect(QGamepadManager::instance(), &QGamepadManager::configurationCanceled, this,[](int deviceId)

{ qDebug() << "configuration canceled:" << deviceId; }

);

Output example:
axis event: 654 0 -0.275959
axis event: 654 1 0.370932
axis event: 654 3 -0.0213169
axis event: 654 0 -0.279225
axis event: 654 1 0.361257
axis event: 654 0 -0.246754
axis event: 654 1 0.280629
axis event: 654 0 -0.15584
axis event: 654 1 0.13225
axis event: 654 3 -0.0248569
axis event: 654 0 -0.090898
axis event: 654 1 0.0515908
Gamepad: Could not read from input device (Aucun périphérique de ce type)

Atached you will find a software draft, using the two methods for detect gamepad disconnection