My sound card stopped working after a set of updates were installed 2 days ago.

The sound card is detected, the volume is not muted and the speakers work, I can make the speakers hum if I touch the jack plug lead that normally plugs into the card.

hugh@lindisfarne:~$ lspci -v | grep -A7 -i "audio" 07:01.0 Multimedia audio controller: Creative Labs CA0106 Soundblaster Subsystem: Creative Labs SB0570 [SB Audigy SE] Flags: bus master, medium devsel, latency 32, IRQ 16 I/O ports at c000 [size=32] Capabilities: Kernel driver in use: CA0106 Kernel modules: snd-ca0106

I've tried reverting those upgraded packages that look like the could impact the kernal - but to no avail.

alsamixer does not have anything muted, I've been though all the sound card debug/troubleshooting pages I can find. Kernal driver is attached. So whats gone pop ?

I will boot from CD to check - but I am pretty sure this is a sw and not a hw problem.