I apologise if this is not helpful here, but......

I had this exact issue on a Dell D620 (with STAC9200) after installing
12.04; Drums on startup, but then only a Digital S/PDIF available)

I found this workaround from a search, which in my case fixes the
speakers, but breaks the headphones(!).

Edit 
        /etc/modprobe.d/alsa-base.conf 

and add the following line to the end: -
        options snd-hda-intel model=gateway-m4

reboot.

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https://bugs.launchpad.net/bugs/946232

Title:
  [Dell Inspiron (MM061, MXC051), SigmaTel STAC9200] Missing speaker
  port

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