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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