I also have some issue, but on another Hardware using the same codec. i can boot but i can only get Sound through headphones,.
It is time to advance and offer some solution!
it is Microsofts responsibility to check compability with signed Drivers, not end users!
It is not our Job to find the update which broke it,it is Microsofts.
i am sitting on a tablet, 3 days old, and just after updating it does not work like before.
i cannot understand why your QA does not test with a Major Driver.
i accidently replied on a previous post.