The abovementioned fix has been included upstream in kernel 2.6.32.12.
>From the changelog:
commit 97d0f3f2a0bd5c346449a61a77dc1d140ca3782f
Author: Daniel T Chen
Date: Tue Mar 30 13:29:28 2010 -0400
ALSA: hda: Fix 0 dB offset for Lenovo Thinkpad models using AD1981
commit b8e80cf386419453678b01bef830f53445ebb15d upstream.
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
Signed-off-by: Daniel T Chen
Signed-off-by: Takashi Iwai
Signed-off-by: Greg Kroah-Hartman
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PCM level is overdriven
https://bugs.launchpad.net/bugs/551606
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