Comment 17 for bug 1238346

I have managed to somehow fix this by installing a different greeter: `lightdm-gtk-greeter`. You get a "not so fancy" greeter (see [1]), but It gives you the right keyboard config.
So the problem should be on the default greeter used...

[1] http://www.smdavis.us/wp-content/uploads/2013/06/ambiance.png