Muting PC Beep (really muting, not just completely turning it down) in
alsamixer on each boot helps as a workaround in my case.
$ cat /proc/asound/card0/codec#* | grep -i codec
Codec: IDT 92HD71B7X
Codec: Intel G45 DEVCTG
$ cat /proc/asound/cards
0 [Intel ]: HDA-Intel - HDA Intel
*** This bug is a duplicate of bug 449940 ***
https://bugs.launchpad.net/bugs/449940
** This bug has been marked a duplicate of bug 449940
System beeps very loud and annoying if when muted.
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Karmic uses normal speakers as PC-beep
https://bugs.launchpad.net/bugs/451575
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