I'm running Debian unstable. My .asoundrc looks like this:
pcm.btheadset
{
type plug
slave
{
pcm
{
type bluetooth
device 5A:5A:5A:A6:08:09
profile "auto"
}
}
}
ctl.btheadset
{
type bluetooth
}
I can play music through the headset, however I cannot control the volume.
$ alsamixer -D btheadset
ALSA lib audio/ctl_bluetooth.c:167:(bluetooth_send_ctl) Unable to receive new volume value from server
ALSA lib audio/ctl_bluetooth.c:161:(bluetooth_send_ctl) Unable to request new volume value to server: Broken pipe
cannot load mixer controls: Broken pipe
daemon.log has this:
bluetoothd[15628]: Invalid message: length mismatch
Any ideas? I suspected this may be some mismatch of binaries, so I tried downgrading bluez to Debian stable. No luck. Maybe I should try the same with alsa libs...
A lot of FAQs and tutorials suggest that PulseAudio should automatically solve this, however I installed it, it pulled down dozens of dependencies I have no interest in, and turned out to be a very user-hostile daemon that refused to play any sound at all. So I am not interested in that as a solution.
Figured out a workaround. Using alsa's softvol plugin to do volume control in software.
Added this to .asoundrc:
pcm.btheadset_softvol
{
type softvol
slave.pcm "btheadset"
control.name "Bluetooth"
control.card 0
}
Now I tell software to play to the device btheadset_softvol and my main sound card's mixer has a "Bluetooth" option.
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