Unfortunately i have discovered different boards have different settings according to each manufacture,my kid has the same chipset on her board but from HP and her interface is nowhere advanced as mine is with the same chipset. so i think maybe you might be out of luck as she too has no headphone volume just one for all.
I guess my options are to live with my Windows volume set to 8% so that it's not too loud when I need to use headphones, or to hunt around for an older driver version and block Windows from downloading any drivers ever again?
I Uninstalled my driver and installed the latest one from realtek (I couldn't get the cab file to work so I used the Realtek package from 11/29/16).
After install, I got the 'Asus' version of realtek audio manager which I did not expect, and I still cannot select Dolby 5.1/ Digital live from the list of output formats.
I was hoping the new drivers would be full featured. Should these drivers be enabling all the chips features or are they just minor updates?
i would suggest going here:
Unlocked Realtek HD Audio Drivers (With Dolby Digital Live and DTS Interactive) | TechPowerUp Forums
some motherboards have features that need certain specific drivers since they are system specific. not all realtek driver updates are for every system, thats why its always best to go to the support site for your specific brand and model of your computer so that you have a backup of a driver that you can be sure will work......
you also can tweak a driver yourself if you have the necessary skills to do so, which is what was done on the site I referenced. but if not, then always keep a backup of the driver that is recommended by your system manuafacurer.....otherwise you never know if your be able to undo an update that wasnt meant for your system
by the way that link is where I learned that certain drivers unlock features on your motherboard that exist but may not be readily apparent or active on your particular system. some motherboards may have the exact same features of a higher end system but the driver deliberately doesnt activate them because your PC is a lesser model. and sometimes all you need is the line of code in the dll file to activate those features....