Boom Bonnet: [SOLVED] This sound device does not have any controls

[mad_ady]

I'm in a pickle again... I'm using the boom bonnet on a C2 running ubuntu 20.04. Installed the boom bonnet as per the wiki instructions, but I don't get any sound controls in alsamixer and sound volume is really low (despite boom bonnet volume knob being maxed out, and my speakers being to the max).
I am running this setup for a few months and sound levels were higher and I think I remember I had volume control in alsa (at least I had on the C1/ubuntu 18).

Any ideas what to try to increase volume?

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drianp@spica-c2:~$ uname -a                          Linux spica-c2 3.16.85-62 #1 SMP PREEMPT Mon Jun 29 16:22:33 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux     adrianp@spica-c2:~$ lsmod | grep snd
snd_soc_odroid_dac      5021  0
snd_soc_pcm5102         4205  1
adrianp@spica-c2:~$ cat /proc/asound/cards
 0 [ODROIDHDMI     ]: ODROID-HDMI - ODROID-HDMI
                      ODROID-HDMI
 1 [ODROIDDAC      ]: ODROID-DAC - ODROID-DAC                               ODROID-DAC
adrianp@spica-c2:~$

[odroid]

PCM5102 DAC has no hardware analog volume control.
The digital attenuator volume control must be controlled by PulseAudio probably in Ubuntu 18 Mate.

[mad_ady]

Ok, thanks! I played a bit with MPD and enabled alsa output from the boom bonnet. With alsa, I can get the true volume I was expecting, so it must be some pulse-audio setting that attenuates too much even at 100% volume.

Here's a db reading at 1m from the speakers - I was playing an Aerosmith song, and the difference is switching from alsa to pulseaudio. The ~20dB sound is very faint.



I'm glad alsa works at full volume.
Here is the relevant mpd config:

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audio_output {                                                type "pulse"                                          name    "Boom Bonnet via Pulse"               #       sink    "alsa_output.platform-odroid_sound_card.5.analog-stereo"                                            sink    "alsa_output.platform-odroid_dac.stereo-fallback"
        mixer_type      "software"
        server  "127.0.0.1"
}
audio_output {
        type "alsa"                                           name    "Boom Bonnet via Alsa"
        device  "plughw:CARD=ODROIDDAC,DEV=0"                 mixer_type      "software"                    }