[pulseaudio-discuss] why isn't PA using hardware volume controls?

[Ernest Adrogué]

Hi,

I noticed that changing the sink volume does not change the hardware mixer
contents:

$ pacmd list-sinks | grep -e index: -e 'alsa\.card ='
  * index: 0
		alsa.card = "0"
$ pactl set-sink-volume 0 25%
$ amixer -c 0 contents > before
$ pactl set-sink-volume 0 75%
$ amixer -c 0 contents > after
$ diff -u before after
$

This only happens when the default port is selected, which is associated
with the "Master Playback" control.  Other ports do use the card mixer.

Is this how it's supposed to work or am I doing something wrong here?

Thanks.