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symon

Member

Registered: 2014-06-25

Posts: 18

Bluetooth automatic profile setting

Hello everyone,
I have a bluetooth headset that I like to use for listening to music. Every now and then it will play the music from my machine excellently but most of the times it sounds really bad.
After a while of digging I figured out it supports two profiles and my machine will chose one on connect.
This is the `pactl list` output:

Karte #0
        Name: bluez_card.20_9B_A5_68_2E_FB
        Treiber: module-bluez5-device.c
        Owner-Modul: 28
        Eigenschaften:
                device.description = "Anker SoundBuds Sport"
                device.string = "20:9B:A5:68:2E:FB"
                device.api = "bluez"
                device.class = "sound"
                device.bus = "bluetooth"
                device.form_factor = "headset"
                bluez.path = "/org/bluez/hci0/dev_20_9B_A5_68_2E_FB"
                bluez.class = "0x240404"
                bluez.alias = "Anker SoundBuds Sport"
                device.icon_name = "audio-headset-bluetooth"
                device.intended_roles = "phone"
        Profile:
                headset_head_unit: Headset Head Unit (HSP/HFP) (Ziele: 1, Quellen: 1, Priorität: 30, verfügbar: ja)
                a2dp_sink: High Fidelity Playback (A2DP-Ziel) (Ziele: 1, Quellen: 0, Priorität: 40, verfügbar: nein)
                off: Aus (Ziele: 0, Quellen: 0, Priorität: 0, verfügbar: ja)
        Aktives Profil: headset_head_unit
        Ports:
                headset-output: Headset (priority: 0, latency offset: 0 usec, available)
                        Teil der/des Profil(s): headset_head_unit, a2dp_sink
                headset-input: Headset (priority: 0, latency offset: 0 usec, available)
                        Teil der/des Profil(s): headset_head_unit

So when it chooses `headset_head_unit` the sound is very poor so I suppose it should select `a2dp_sink` every time. Now I know I can change the profile every time using `pacmd set-card-profile 0 a2dp_sink` but is there a more convenient way to do this?
Especially since the card number changes every time?
Also: How does pulse select the profile in the first place? (I think the `a2dp_sink`-profile actually is not available in the first seconds after connecting.)
I can also change it manually in the KDE settings but that seems to be temporary as well.

Edit: I managed to write a small script, that does change the correct card to the correct mode but I can't seem to find a way to run it on bluetooth-connect. I struggle with udev. Maybe an answer on how to d that would do the job as well.

Thanks in advance
symon

Last edited by symon (2019-07-19 11:14:03)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,770

Re: Bluetooth automatic profile setting

How do you control the Bluetooth device?  I use blueman ro connect to my bluetooth speaker.  I only allow it to open the hi def audio profile and block the "headset" profile

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symon

Member

Registered: 2014-06-25

Posts: 18

Re: Bluetooth automatic profile setting

I set them up using the KDE menu. So I did not really fiddle around with the background tasks.