you could try this which help'd me and it was instead of
options snd-hda-intel model=3stack-6ch
*I used this but had to continuously plug/unplug my headphones before it would work and upon system restart it continued to not work till I started plugging/unplugging it again...would take up to 8 times before it worked.*
I instead used
options snd-hda-intel model=targa-dig
This option worked for me the first go round....system restart and still working. Might hafta play around with different variation's depending on your system and see what happen's.
I have an MSI EX600 Laptop and this has been the only problem that I've had thus far with Ubuntu and now it's fixed.
Hope this help's someone out there =P
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