Open Terminal and Enter the following line
Add the following line to the file
Now Reboot your computer and open "alsamixer" by entering it into the terminal and unmute the Center & Surround Speakers.
That's it! Enjoy your 5.1 Surround Sound :)
sudo gedit /etc/modprobe.d/alsa-base.conf
Add the following line to the file
options snd-hda-intel model=3stack-6ch enable=1 index=0
Now Reboot your computer and open "alsamixer" by entering it into the terminal and unmute the Center & Surround Speakers.
That's it! Enjoy your 5.1 Surround Sound :)