Comment 2 for bug 1706524

This isn't a good answer for people working with laptops, where this issue occurs the most. I don't want have speakers with me everwhere I'm travelling :p

Note that this option is already shown in gnome-control-center, just not available from main UI. The option is off by default and people know what to expect when they switch it on. It's already available in Unity since 14.04.