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a60fb26
(Get the code!)
I can get audio using either of the two headphone jack connectors (middle and right connectors) in my headphones (ordinary in-ear headphones). A google search on S/PDIF mentions that some laptops have a combined S/PDIF and headphone connector socket, which is likely to be one of the jacks on the front panel.
With alsamixer:
Speaker -- effects the internal built-in speaker volume
Front -- effects the volume of the headphone jacks
Master -- effects both Speaker and Front volume
So for me, alsa/alsamixer are applying the volume correctly. Also, the jack detection was working with Ubuntu before the switch to pulseaudio, and worked on the Vista setup that came with the machine.
I will try the suggested fix on the other defect to see if that works for me as well.