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67d34a1
(Get the code!)
Having same issue w/ master volume that seems to only have values for mute and ear blasting.
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
Chip: SigmaTel STAC9227
Tried the replacing merge with ignore trick in alsa conf, didn't seem to help (well, maybe there was a slight variation in volume, could be my imagination).
ignore_dB=1 in pa didn't help either.
attempting control=PCM had interesting effect - it seemed volume adjusted more correctly, but it kind of skipped and stuttered as I adjusted it, and the application I was using (mplayer) hung completely for a while, then skipped a bit, so I removed it.
FWIW, playing around in alsamixer, seems that, at least when using PA, master does nothing. PCM or "Speaker 3" do seem to control volume correctly.