1) Which kernel? (``uname -r'')
2) Try booting with "acpi=off" appended to the kernel command line. If that fails to produce audible sound, too, try adding "noapic".
** Changed in: alsa-lib (Ubuntu)
Sourcepackagename: alsa-lib => linux-source-2.6.15
Status: Unconfirmed => Needs Info
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SiS 7012 doesn't work
https://launchpad.net/bugs/47221