Raymond, below some answers:

* do your computer chassis have hda front audio panel with Jack
detection ?

The computer chassis does have front audio panel, I'm not sure how to
check "visually" if it has Jack detection or not. The chassis is exactly
this one:
http://www.sentey.com/en_productos_details.php?tipo=Gabinetes&ctg=Professional%20Series&prod=ps2-3270

* do your BIOS have any option to set front audio panel type :hda or
AC97?

Will check next time I reboot; motherboard is Intel DP55WG (perhaps that
answers your question?)

In any case, is worth noting that audio playback works perfectly both in the 
headset using the front audio connectot and in the speakers plugged in the rear 
audio output (they work perfectly *at the same time*, until they both stop 
working altogether).
I have also tried unplugging one of each at a time (ie have only headset, have 
only speakers). This does not look like a hardware issue, since audio works for 
some random amount of time after a reboot.

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https://bugs.launchpad.net/bugs/1201528

Title:
  [Realtek ALC889] - Audio Playback Unavailable

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