When I boot up my Macbook from cold, I am unable to use my bluetooth devices until I've logged in first using my Macbook's keyboard. It's been midly irritating me for some time. Midly in the sense that I've just accepted that this as the way with a tut. I finally decided to look into why this was happening and have managed to sort it! Ok, this is arguably a bit of a workaround, but at the very least I can say I've got rid of the mild irritation.