I haven't seen this since disabling the parallel port in the bios, so it was almost certainly caused by an IRQ conflict. But it does look like a bug that 90% of the time, IRQs were assigned so the sound card worked, and the rest it didn't.
-- Sound card occasionally not found https://launchpad.net/bugs/77180 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
