[pulseaudio-discuss] Audio unstable using HFP profile on IMX6

Georg Chini georg at chini.tk
Thu Aug 13 09:42:16 PDT 2015

On 12.08.2015 17:17, Mallory Daries wrote:
> Hi,
> I'm currently integrating in Yocto pulseaudio 6.0 with bluez 5.28 and ofono 1.16 on a Nitrogen6x board (with dongle bluetooth Belkin).
> My purpose is to use the board as handsfree gateway:
> with a smartphone connected via bluetooth redirect the sound of a voicecall from the smartphone to the board output (HFP profile).
> I already got it work on my computer as I can hear the voicecall with the computer's speaker as output and use the integrated microphone as input.
> I'm using Pulseaudio launched as a user-instance with the backend ofono.
> I had strange behaviour testing it :
> After connecting my phone with bluetoothctl pulseaudio create an HF card and I got the same output as on my computer where HFP is working
> D: [pulseaudio] bluez5-util.c: oFono is running: yes
> D: [pulseaudio] backend-ofono.c: New HF card found: /card_4
> D: [pulseaudio] backend-ofono.c: RemoteAddress: 40:A6:D9:6E:1B:73
> D: [pulseaudio] backend-ofono.c: LocalAddress: 00:0A:3A:7A:3A:58
> D: [pulseaudio] bluez5-util.c: Transport /card_4 state changed from disconnected to idle
> D: [pulseaudio] module-bluez5-discover.c: Loading module-bluez5-device path=/org/bluez/hci0/dev_40_A6_D9_6E_1B_73
> I: [pulseaudio] module-card-restore.c: Restoring port latency offsets for card bluez_card.40_A6_D9_6E_1B_73.
> I: [pulseaudio] card.c: Created 1 "bluez_card.40_A6_D9_6E_1B_73"
> D: [pulseaudio] module-bluez5-device.c: Acquiring transport /card_4
> E: [pulseaudio] backend-ofono.c: Deferred setup failed on fd -1: Transport endpoint is not connected
> I dial a number on my phone and it works well at the first try, the audio is routed to the output of the board.(see pulseaudio_log_success_HFP)
> Then, I hangup the call and make a second try, and the problems are coming :
> pulseaudio loops for few minutes in the following :
> I: [alsa-sink-HiFi sgtl5000-0] module-loopback.c: Could not peek into queue
> D: [bluetooth] module-loopback.c: Requesting rewind due to end of underrun.
> and I also have this kind of messages with dmesg :
> Bluetooth: hci0 SCO packet for unknown connection handle 0
> Bluetooth: Unexpected continuation frame (len 0)
> Bluetooth: Unexpected continuation frame (len 0)
> Bluetooth: Unexpected continuation frame (len 0)
> No sound can be heard in that case.
> Any help would be appreciated !
> Ask me for any further information that could be useful.
> Mallory
Hi Mallory,

use another dongle! I also tried first with a Belkin dongle and had 
massive problems.
My very old other dongles work fine and I bought a Gembird V.2.1 dongle 
which also
works perfectly.


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