Two things I would suggest is: 1) try to see if there is a more updated driver for that realtek and 2) is there another audio jack, such as on your case, that you can plug into?
I already got the latest drivers, but no change. And I noticed a scraching sound from my front speakers which are plugged in green jack, but rear, center and sub is crystal clear.
I alredy tried to put them in front panel but it didnt recognize them. And my headphones is plugged in front panel.
Also when I put the green plug half-way in the green jack, sound right speaker and only right. So by doing some research i decided it is a jack problem, maybe there is something bended inside the jack or so.
Already ordered Creative SB X-Fi Titanium. Its time to advance from onboard audio to something better
But anyway, thanks!