Another thing you could try, is messing with the "options" by replacing them with vendor. As yours is a Realtek, I'd try this.
Goto the bottom of the file, and add this line:Code:sudo nano /etc/modprobe.d/alsa-base
options snd-hda-intel model=realtek
May or may not work. For other "options" to use, have a look at this webpage: