Just bought a SP11 and have issue with keyboard not working after a complete shutdown. This happens every time. The only solution is to detach and reattach the keyboard, very annoying.
Temporary solution is not shutting down the laptop, but just close the lid.
This is definitely not keyboard problem, but something wrong with the Microsoft driver/firmware. So many users are having the exactly same problem. The old pin type keyboard has no such problem, this new concept keyboard is useless, not many people will use it with keyboard detached.
Just found out this new keyboard has tiny pins too, so it is physically connected, why is it not working when the windows starts. In bios the keyboard is working good.