For a not perfect solution but at least for stereo output working use Voodoohda.
It sometimes makes a few probs but you have stereo.
I hope someone will find a better solution.
Perfect for me, it works
Did a fresh install of mavericks so all sound drivers were back to stock, then installed the latest voodooHDA
Stereo sound only, and input isn't working, but I don't use that so it does not matter for me.