I believe this issue is about to be fixed. Can you please try installing
http://people.canonical.com/~diwic/temp/alsa-intel-hda-optiplex-
dkms_1.0.23_all.deb , reboot and report back whether it fixes your
problem?
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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No sound from headphone jack but build-in speakers work properly in ASUS K42jr
https://bugs.launchpad.net/bugs/580338
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