Bluetooth in ear does work but not for Bose QC Ultra

Hello,

I have four pairs of in ears:

  • Airpods Pro
  • Sony WF-1000MX4 and Sony WF-1000MX5
  • Bose QC Ultra.

They work as expected (insert in ear, headphone becomes visible in KDE Sound and speaker output and mic input is transferred to headphones), except for the Bose QC Ultra. After paring the QC Ultra, everything works again as expected.

After a reboot and a connect, Bluetooth reports connected but the headphone doesn’t show up under Sound or under Devices in the Volume applet.

I don’t even know where to begin troubleshooting in this case.

Well bluetooth and Linux sometimes is very hard to get it running.
Maybe the thread https://forum.endeavouros.com/t/bose-qc-headphones-cant-connect-via-bluetooth-on-lenovo-thinkpad-t14/62697 can help you.