Comment 27 for bug 411574

I have also lost my sound on upgrade

$ lspci -v
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)
 Subsystem: COMPAL Electronics Inc Device 0024
 Flags: bus master, fast devsel, latency 0, IRQ 20
 Memory at f8400000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: <access denied>
 Kernel driver in use: HDA Intel
 Kernel modules: snd-hda-intel

$ cat /proc/asound/card*/codec* | grep Codec
Codec: Realtek ALC268
Codec: Motorola Si3054

$ uname -a
Linux fiver 2.6.31-10-generic #32-Ubuntu SMP Thu Sep 10 23:33:50 UTC 2009 i686 GNU/Linux