setting volume for alsa output is either 0 or 100%, nothing in between an dvolume reported is wrong

[solsticedhiver]

On latest mpd git (b1677bf), I can no longer properly control the volume of the alsa output (USB device)

If it is at zero, no sound as expected.
But as soon as I increase it to 5%, the alsa output is set to max volume. I can double check that in alsamixer where I can see the volume at 100% for that output.

So the volume is either null or at full volume, while mpd reports a volume at whatever percent it think it is. In my example, it reports it at 5%.

This is happening with mpc or mympd client, the same way.

This was working perfectly fine on 0.23.15

# part of my mpd.conf
audio_output {
        type            "alsa"
        name            "ALSA output"
        device          "hw:1,0"        # optional
        mixer_type      "hardware"
        mixer_device    "hw:1"
        mixer_control   "Speaker"
        mixer_index     "0"
        buffer_time     "200000"
        period_time     "5084"
}

mpd is running on a rpi3b (armv7), 32bit, with archlinuxARM, linux 6.12.5, alsa-lib 1.2.13, alsa-plugins 1.2.12, and a USB card (Unitek Y-247A)