How to disable absolute volume with pipewire-pulse?

reddit.com/archlinux/disabling_bluetooth_absolute_volume_with_pipewire

create a file:

~/.config/wireplumber/wireplumber.conf.d/80-bluez-properties.conf

With content:

monitor.bluez.properties = {
bluez5.enable-hw-volume = false
}

Reboot the system or restart wireplumber and pipewire.

Bluetooth configuration — WirePlumber 0.5.2 documentation

Most Bluetooth audio devices do not use ALSA, but bluealsa is available from AUR
GitHub - arkq/bluez-alsa: Bluetooth Audio ALSA Backend

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