Try my new ppa (ubuntu4~ppa1): https://launchpad.net/~xt-
knight/+archive/ppa

Plus, set Master to 100% and adjust PCM.  This is a better method,
because Master goes from 0-31 and PCM goes from 0-255, at least on most
cards.  PCM is a higher resolution adjustment.  It works with PulseAudio
in my experience.  I think PulseAudio adjusts through ALSA anyway.  This
is why I made the change at such a low level.  The constant is now 0.5
instead of 0.7.

Don't use PulseAudio's volume control in pavucontrol.  I think there's
other serious bugs in that right now, at least in Karmic.  Use alsamixer
under the terminal and set Master to 100%, adjust PCM.  Sometimes you
have to press the down or up arrow multiple times simply because all the
volumes you adjusted to map to the same volume.  Or maybe it's a
rounding issue.

dB gain readings may be broken with this patch.  It should be able to be
fixed easily.

** Attachment added: "vol_ctrl_0.5.png"
   http://launchpadlibrarian.net/29779611/vol_ctrl_0.5.png

-- 
Better (non-linear) volume control
https://bugs.launchpad.net/bugs/204898
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