29 Aug
2010
29 Aug
'10
4:35 a.m.
2010/8/27 David Henningsson david.henningsson@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)