Looks like your hardware's dB info is bogus. See
https://wiki.ubuntu.com/DebuggingSoundProblems/KarmicCaveats#Volume%20range%20anomalies
** Package changed: pulseaudio (Ubuntu) => alsa-driver (Ubuntu)
** Changed in: alsa-driver (Ubuntu)
Status: New => Confirmed
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[ICH - Intel 82801AA-ICH] PA test tone failed (alsa tone succeeded)
https://bugs.launchpad.net/bugs/561768
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