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.
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 d/alsa- base.conf
/etc/modprobe.
and add the following line to the end: -
options snd-hda-intel model=gateway-m4
reboot.