Ubuntu – Failed to change profile to headset_head_unit


I got the Sony MDR-ZN770BN connected to my PC via bluetooth. But I can only use A2DP. When I switch it to HSP, I get message "Failed to change profile to headset_head_unit", so no skype calls possible. Any help guys? :/

Best Answer

I had the similar problem with Galaxy Earbuds+ and here is how I solved it:

My earbuds profiles were A2DP, AVRCP and HFP and no support for HSP. Pulseaudio only supports HSP out-of-the-box. That's why I couldn't switch to HSP/HFP. In order to make HSP/HFP work, you have to enable HFP on pulseaudio which needs ofono. Here is how I did it on Ubuntu 18.04:

  1. Install ofono:
sudo apt install ofono
  1. Config pulseaudio to use ofono:
  • Goto /etc/pulse/default.pa find the line load-module module-bluetooth-discover and change it in load-module module-bluetooth-discover headset=ofono.
  • Add the user pulse to group bluetooth to grant the permission: sudo usermod -aG bluetooth pulse (probably it's already correct)
  • VERY IMPORTANT: To grant the permission, add this to /etc/dbus-1/system.d/ofono.conf (before </busconfig>):
<policy user="pulse">
  <allow send_destination="org.ofono"/>
  1. Provide phonesim to ofono. In order to make ofono work, you have to provide a modem to it! You can install a modem emulator called phonesim (implemented by ofono) to make it work:
  • install ofono-phonesim (in some distros it is called phonesim). in Ubuntu 18.04 (for Ubuntu 20.04 follow this link):
sudo apt install ofono-phonesim
  • Configure phonesim by adding the following lines to /etc/ofono/phonesim.conf:
  • Restart ofono:
sudo systemctl restart ofono.service
  • Start phonesim:
ofono-phonesim -p 12345 /usr/share/phonesim/default.xml

Note that the command can be phonesim. To make sure phonesim is started correctly you can clone the ofono repo and use their test scripts:

cd /tmp
git clone git://git.kernel.org/pub/scm/network/ofono/ofono.git
cd ofono/test

You should see the modem in the result. You might have to first enable the modem by executing enable-modem and online-modem scripts in the same directory.

  • Once the modem is enabled, you should be able to enable HFP profile.

4.autostart phonesim. Since you have executed phonesim manually, after every restart you should execute it again. Instead you can install ofono-phonesim-autostart which will start the phonesim as a service.