[alsa-devel] alsactl adds volume controls?

Raymond Yau superquad.vortex2 at gmail.com
Sun Aug 29 03:35:32 CEST 2010

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)

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