@Jihwan Song and others: You're right. The problem only occurs when I'm logged in in Unity 3D. I've tested it Unity 2D, Gnome shell, KDE and XFCE.
@Jihwan Song and others:
You're right. The problem only occurs when I'm logged in in Unity 3D. I've tested it Unity 2D, Gnome shell, KDE and XFCE.