(Just a note: the alsa-oss package is irrelevant to your symptom.)
Is the symptom reproducible after following
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules?
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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Headphones don't work and don't mute speakers
https://bugs.launchpad.net/bugs/677652
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