Notice that your sound hardware has been allocated no resources (as evidenced by your /proc/interrupts contents). This means that the sound driver, snd_via82xx, cannot function properly and thus you have "no sound."
Did you try my recommendation from #ubuntu/Freenode to disable all unused devices in BIOS? Have you tried booting with "acpi=off" and/or "noapic"? ** Changed in: Ubuntu Sourcepackagename: None => linux-source-2.6.15 Importance: Untriaged => Low Status: Unconfirmed => Needs Info -- No more sound (VIA 8233) in Dapper after upgrade from Breezy https://launchpad.net/bugs/56878 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs