Bluetooth HPF profile outputs garbage

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Hey everyone,


I am using a odroid c2 board with Armbien Buster image. I have a cheap bluetooth dongle and a usb sound card connected to the board. I am trying to use the board as bluetooht to aux input for my car. The board is working as expected when the a2dp profile is in use. But as soon as i place or receive a phone call i am getting garbage sound(garbage meaning a bunch of click like sound) after a while my phone drops the bluetooth connections and gives the sounds to earpiece on the phone. Also when the phone call places my syslog gets filled with "Bluetooth: hci0: SCO packet for unknown connection handle 0"


I am using bluez5, alsa and pulseaudio stack as for software. I tested this setup in another laptop with the same dongle and usb sound card and I am not having any issues. At this point I am really confused to if this is a harware or software issues. Hopefully someone here might help me out.


 hciconfig -a
hci0:   Type: Primary  Bus: USB
        BD Address: 00:1A:7D:DA:71:13  ACL MTU: 310:10  SCO MTU: 64:8
        UP RUNNING
        RX bytes:1242822 acl:3880 sco:13653 events:301 errors:0
        TX bytes:102859 acl:151 sco:1844 commands:105 errors:0
        Features: 0xff 0xff 0x8f 0xfe 0xdb 0xff 0x5b 0x87
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'bmw-agent'
        Class: 0x2c0000
        Service Classes: Rendering, Capturing, Audio
        Device Class: Miscellaneous,
        HCI Version: 4.0 (0x6)  Revision: 0x22bb
        LMP Version: 4.0 (0x6)  Subversion: 0x22bb
        Manufacturer: Cambridge Silicon Radio (10)


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[    3.174771] usb 1-1.4: New USB device found, idVendor=0a12, idProduct=0001, bcdDevice=88.91
[    3.174783] usb 1-1.4: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[    3.174787] usb 1-1.4: Product: CSR8510 A10


Odd. Should work...

Did a quick search fro the noise in the logs and found this:

Maybe it helps

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