Hello,
I tried the driver you suggested.
I uninstalled my previous driver, rebooted, installed the new one and rebooted again.
No difference prom the one i had - still no option to play separate audio streams and no dolby options.
I noticed that when i have no drivers installed and i let windows manage sonds i get 3 "Speakers" in playback devices : speakers, sub-woofer and headphones.
And i can choose to play sound through speakers and skype through headphones ... but the sub-woofer is not used.
This is really annoying ... and it's only a software issue.
I hope there will be a fix for this