I don't know how I have it connected, but I'm sure that from the front panel comes one wire with 2 plugs one is hd and the 2nd one is ac97 afair. So when I change from AC to HD it should detect headphones correctly?

Also I think something is broken in this drivers, when I change few times from 5.1 to headphones and vice versa I get some strange problems, like I play SC2 with Teamspeak and Headphones set and when I alt+tab to windows and for example start watching some movie on youtube I have no sound. Only way to bring sound back is to exit sc2.

Sometimes youtube movies play ok but I can't listen to music using foobar or wmp - getting some weird errors.