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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