I have the same problem. My audio section from lspci -v gives:
00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER (ICH5/ICH5R)
AC'97 Audio Controller (rev 02)
Subsystem: Intel Corporation Device e001
Flags: bus master, medium devsel, latency 0, IRQ 17
Memory at febff800 (32-bit, non-prefetchable) [size=512]
Memory at febff400 (32-bit, non-prefetchable) [size=256]
Capabilities: <access denied>
Kernel driver in use: Intel ICH
Kernel modules: snd-intel8x0
Setting ignore_dB=1 doesn't seem to help at all. Running alsamixer and
reducing gain to 0 on PCM fixes it though.
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0x11d41981 on 0x103c30d8 misreports dB information
https://bugs.launchpad.net/bugs/461062
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