Как держать картинку поверх всех программ и окон?

#!/usr/bin/python3
# -*- coding: utf-8 -*-
__author__ = 'evgeny'

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *


if __name__ == '__main__':
    app = QApplication(sys.argv)

    class trayApp(QSystemTrayIcon):
        def __init__(self,  parent=None):
            QSystemTrayIcon.__init__(self,  parent)

            self.splash = QSplashScreen(QPixmap('x.png'), Qt.WindowStaysOnTopHint)
            self.splash.show()

            # Таймер добавил для циклического поднятия наверх
            self.timer = QTimer()
            self.connect(self.timer, SIGNAL('timeout()'), self.raising)
            self.timer.start(1000)

            self.quitAction = QAction(self.tr('&Exit'), self)
            self.connect(self.quitAction, SIGNAL('triggered()'), app, SLOT('quit()'))

            self.trayMenu = QMenu()
            self.trayMenu.addAction(self.quitAction)
            self.trayIconImage = QIcon('x.png')
            self.setIcon(self.trayIconImage)
            self.setContextMenu(self.trayMenu)

            self.show()

        def raising(self):
            self.splash.raise_() # не помогает
            print('Raised!')

    main = trayApp()
    sys.exit(app.exec_())

Some X11 window managers do not support the "stays on top" flag. A solution is to set up a timer that periodically calls raise_() on the splash screen to simulate the "stays on top" effect.