After the upgrade to 15.04 I now get a double lock screen when I wake up from resume. First there will be a centered GTK grey panel which looks a bit like the old switch user login, after I enter that password I'm then presented with a lock screen that is the some one I'll get if I Super+L.
It's not ruining everything, but it's pretty awkward to have to relogin twice on every resume. Any idea how I can disable the first lock screen and just get the Super+L one?