It's interesting that not only has this fix gone into the kernel, it is
also mentioned in the changelog for the just-released ALSA 1.0.23.

    - ALSA: hda: Fix 0 dB offset for Lenovo Thinkpad models using AD1981 
    BugLink: https://launchpad.net/bugs/551606 
    The OR's hardware distorts at PCM 100% because it does not correspond to 
    0 dB. Fix this in patch_ad1981() for all models using the Thinkpad 
    quirk. 
    Reported-by: Jane Silber

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PCM level is overdriven
https://bugs.launchpad.net/bugs/551606
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