I can confirm that the updated jaunty kernel does resolve the sound via speakers issue and the headphone jack continues to work, however it seems the microphone does not work nor does sound cut off from the speakers when the headphones are plugged in.
I can confirm that the updated jaunty kernel does resolve the sound via speakers issue and the headphone jack continues to work, however it seems the microphone does not work nor does sound cut off from the speakers when the headphones are plugged in.