I am affected by this problem and possibly another very similar issue using a
Sony MDR-100ABN headset.
Using two different computers (one with BT built-in, one with a USB-Dongle),
both running Ubuntu 17.04 (same bluez and pulseaudio versions), I experience
different behavior.
On PC1 I have the same error as described but after several pairing/unpairing
or connecting/disconnecting tries this can is often resolved. This means
switching between A2DP (stereo output) and HFP/HSP (mono output, mono input) is
working just fine.
Ultimately this looks like an actual bt connection issue to me.
On PC2 the behavior is similar, but with a different error message:
"[pulseaudio] backend-native.c: connect(): Die angeforderte Funktion ist
nicht implementiert" (I think the original libc string is "Function not
implemented"). Here I haven't been able to get HFP/HSP working at all.
Both systems show the headset connected as 'Headset', 'Handsfree' and
'Audio-Ausgabe' (='Audio output').
The output from bluetoothctl is also the same:
<snip>
[h.ear (MDR-100ABN)]# show
Controller 00:15:83:E8:XX:XX (masked)
Name: XXX (masked)
Alias: XXX (masked)
Class: 0x0c0104
Powered: yes
Discoverable: yes
Pairable: yes
UUID: Headset AG (00001112-0000-1000-8000-00805f9b34fb)
UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
UUID: A/V Remote Control (0000110e-0000-1000-8000-00805f9b34fb)
UUID: Generic Access Profile (00001800-0000-1000-8000-00805f9b34fb)
UUID: PnP Information (00001200-0000-1000-8000-00805f9b34fb)
UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
UUID: Audio Sink (0000110b-0000-1000-8000-00805f9b34fb)
UUID: Audio Source (0000110a-0000-1000-8000-00805f9b34fb)
Modalias: usb:v1D6Bp0246d052B
Discovering: no
</snip>
Software versions:
pulseaudio, pulseaudio-module-bluetooth and pulseaudio-utils: 1:10.0-1ubuntu2
(amd64)
bluez: 5.43-0ubuntu1 (amd64)
Please let me know what other type of information you need and I will
try to provide that.
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1704297
Title:
Bluetooth audio stuck in A2DP profile ([pulseaudio] module-
bluez5-device.c: Refused to switch profile to headset_head_unit: Not
connected)
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