[alsa-devel] alsactl adds volume controls?

[Raymond Yau]

2010/8/27 David Henningsson <david.henningsson at canonical.com>

> So I've discovered that my sound card has a "PCM Playback Volume"
> control, but changing that control does not alter the volume. This is
> not only confusing but also a problem for PulseAudio. (PA merges this
> control into it's overall volume, and so when the user moves PA's volume
> control, in some ranges nothing happens.)
>

The "PCM Playback Volume" is a hardware volume control for those AC97 codec
( the name is "Wave" in Windows )

The "PCM Playback Volume" is most likely softvol on HDA Intel since it is
defined in HDA-Intel.conf

AFAIK, aplay has an option to disable softvol by using SND_PCM_NO_SOFTVOL

   --disable-softvol   disable software volume control (softvol)