I found some related bug reports in PulseAudio and ALSA
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4331
http://pulseaudio.org/ticket/457
To resume them briefly:
The STAC9200's data-sheet says that the hardware has the following
layout:
front device -> softvol plugin "PCM" --> hw device ---> "Master" Volume
|-> "LFE" Volume
LFE is a mono channel (L+R) connected to the subwoofer with it's own
hardware volume.
Pulse's developers assume that ALSA's master volumes should control all
analog outputs (in this case "LFE + Master"). So the driver should be
fixed.
ALSA developers says that the driver's job is only to expose the
hardware features, (in this case two separate volumes LFE, Master), and
that higher level applications should take care of that.
The reports are 14 months old...I don't think this would be fixed by
either of them, maybe ubuntu should try to automatize the work around at
pulseaudio install time?
** Bug watch added: ALSA Bug Tracker #4331
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4331
** Bug watch added: PulseAudio sound server #457
http://pulseaudio.org/ticket/457
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[karmic][lucid] Intel HDA 82801G (ICH7) | STAC9200 - Mixer controlling wrong
settings
https://bugs.launchpad.net/bugs/441195
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