I have no sound on my imac, with 12.04 from a clean install from CD. I have checked alsamixer and a number of other things. Still no sound.
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This is what I did to fix it.
sudo gedit /etc/modprobe.d/modprobe.conf
A new file will be opened, write a line below then save.
options snd_hda_intel model=mb5
Close file Reboot the computer. After rebooting, speaker will show in a mute, adjust the sound preference and set "The selected device" to "Analog Stereo Output" or 'Analog Stereo Duplex'"
That was a direct quote from ubuntu forum.
I tried for what seemed like ever to get the headphone sound to work on my iMac with 12.04 and 12.10. Nothing worked except recently:
upgraded to Linux Kernel 3.7.3.
All is working spiffy from the headphone jack now.
Hope this helps.
On a mac mini:
- Sound settings
- Output tab
- Highlight Headphones. Adjust output volume.