Bluetooth + amixer volume control

[rpi]

Hi,

I'm using the following .asoundrc file:

pcm.!default {
  type plug
  slave.pcm plugequal;
}
ctl.!default {
  type hw card 0
}
ctl.equal {
  type equal;
}
pcm.plugequal {
  type equal;
  slave.pcm bt
}
pcm.equal {
  type plug;
  slave.pcm plugequal;
}
pcm.bt {
    type plug
    slave.pcm {
        type bluealsa
        device "32:00:00:02:84:BD"
        profile "a2dp"
        delay -20000
    }
}

I cannot change the volume in the Bluetooth device using amixer. I tried:
amixer sset PCM 0% -M
amixer -D default sset PCM 0% -M
amixer -D bt sset PCM 0% -M
The volume doesn't change.

Thanks!

 

[Greg Erskine]

Does alsamixer give you some visual clue?

 

[rpi]

alsamixer shows volume change for PCM when I use:
amixer -D default sset PCM 0% -M

But the volume level in the Bluetooth speaker doesn't change.

If I run:
alsamixer -D bluealsa
it shows:
This sound device does not have any controls.

$ amixer scontrols
Simple mixer control 'PCM',0


$ amixer controls
numid=3,iface=MIXER,name='PCM Playback Route'
numid=2,iface=MIXER,name='PCM Playback Switch'
numid=1,iface=MIXER,name='PCM Playback Volume'
numid=5,iface=PCM,name='IEC958 Playback Con Mask'
numid=4,iface=PCM,name='IEC958 Playback Default'