So let's sum up here.
There is a bug in the driver for your (possibly integrated) soundcard
that makes it output the wrong mixer sliders, or the right mixer sliders
but the wrong names, and this confuses PulseAudio.
You might be able to work around it at the PulseAudio level by modifying
"mixer path" configuration files, I have yet to master how to do that,
so I can't help you currently.
The other workaround, "load-module module-alsa-sink control=PCM" first
relies on you to find a proper mixer in alsamixer that works the way you
want your "master" to work. Assuming the "PCM" slider does that, the
workaround will make all other mixers disappear, but they're still
available for adjustments in alsamixer.
** Package changed: alsa-driver (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
** Changed in: linux (Ubuntu)
Status: New => Triaged
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Volume Control wrong for 5.1 sound
https://bugs.launchpad.net/bugs/501034
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