From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Henningsson <david.henningsson@canonical.com>
Subject: Kernel 3.2, and "speaker" controlling headphone path
Date: Wed, 11 Jul 2012 12:50:20 +0200
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Cc: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
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It seems like on one machine the "Speaker Playback Volume" was part of 
the headphone path, in combination with PulseAudio this is leading to 
muted headphones.

One of my colleagues wrote a workaround for that specific machine - I'm 
providing links in case you're interested:

The patch:
https://launchpadlibrarian.net/109499922/restrict_bass.patch

Alsa-info:
https://launchpadlibrarian.net/109251353/bad-kernel-yes-headphones.txt

Bug link:
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/994685


-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic