It seems the Bose Quiet Comfort 35 does has issues with pairing with Bluetooth LE (Low Energy).
Get back to a clean state
I would recommend to clean up you past attempts to pair:
- On Ubuntu, remove the headphones from the Bluetooth paired list.
- On the headphones, hold the switch in Bluetooth pairing position for 10 seconds to delete all paired devices (You'll get a voice confirmation).
- If you can, deactivate Bluetooth on other surrounding devices to make sure they won't interact.
Deactivate Bluetooth LE
Edit Bluetooth configuration file:
sudo nano /etc/bluetooth/main.conf
Replace:
#ControllerMode = dual
with:
ControllerMode = bredr
Restart Bluetooth:
sudo service bluetooth restart
Pair
- Make sure the headphones are in pairing mode.
- Pair with System Settings > Bluetooth
- Select & test the headphones in System Settings > Sound. You may want to choose High Fidelity Playback (A2DP Sink) for high playback quality.
Reactivate Bluetooth LE (optional)
As it is only the pairing that has to be done without Bluetooth LE, once it is paired you can go back to the original configuration:
sudo nano /etc/bluetooth/main.conf
Replace:
ControllerMode = bredr
with:
#ControllerMode = dual
Restart Bluetooth:
sudo service bluetooth restart
Troubleshooting
If you have issues connecting back after disconnecting/rebooting:
- Make sure you have the computer and Bluetooth turned on before the headphones.
- If Connection is grayed out in System Settings > Bluetooth, you can use the Bluetooth menu in the menu bar (next to the clock) to do Connection On/Off.
pavucontrol
-> "Configuration" (tab), and then for the Bose QuietComfort 35 profile select "High Fidelity Playback (A2DP Sink)". Hope this helps!