bug#38915: Can't change profile of Bluetooth headphones

[Matthew Leach <matthew@mattleach.net>]

Ricardo Wurmus <rekado@elephly.net> writes:

> Hi Matthew,

Hi Ricardo,

Thanks for your reply.

>
>> I have a pair of Bluetooth headphones that I I've paired and connected to
>> my guix machine.  They show up in the 'configuration' tab of
>> pavucontrol.  By default the profile is 'Headset Head Unit (HSP/HFP)'.
>>
>> When I try and change the profile to 'High Fidelity Playback (A2DP Sink)'
>> this fails and the headphones are stuck in the HSP profile.
>>
>> I see the following line in `/var/log/debug' when attempting to switch
>> profiles:
>>
>> --8<---------------cut here---------------start------------->8---
>> W: [pulseaudio] module-bluez5-device.c: Refused to switch profile to a2dp_sink: Not connected
>> --8<---------------cut here---------------end--------------->8---
>>
>> It looks as though this may have something to do with pulseaudio running
>> as the GDM user: [0].  My current work-around for this is:
>>
>> --8<---------------cut here---------------start------------->8---
>> $ sudo killall pulseaudio && pulseaudio
>> --8<---------------cut here---------------end--------------->8---
>>
>> to make pulseaudio run as my user.
>
> For what it’s worth: if you have a setup that doesn’t require
> pulseaudio it is possible to use bluez-alsa (running bluealsa as a
> daemon) and configure it to use the a2dp profile. I’m using this on a
> headless “server” in the living room to send music to bluetooth
> speakers.

Ideally I'd like to use pulseaudio as I have multiple streams that I
send to my bluetooth speaker. Nevertheless, I tried to give bluez-alsa a
go but I failed to kill pulseaudio. It would always start back up as the
GDM user.

>
>> [0]: https://wiki.debian.org/BluetoothUser/a2dp#Refused_to_switch_profile_to_a2dp_sink:_Not_connected
>
> The second workaround requires writing a configuration file to the gdm
> user’s home directory. Is this something that we could do in the gdm
> service configuration?

Ideally i'd like to stop GDM running pulseaudio as I can test out your
solution above and it may fix this issue. I'm unsure how to modify GDMs
configuration, however.
-- 
Matt