Unfortunately, Linux support for X-Fi cards is not currently that great.
The best you can do is to update to the latest alsa drivers, as outlined
here: https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules.
Please report back as to whether this gives you any sound at all.
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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[HDA-Intel - HD-Audio Generic] ALSA test tone not correctly played back
https://bugs.launchpad.net/bugs/636145
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