Hi YouRen, Den tis 9 apr. 2019 kl 22:31 skrev <YouRen.Chen@xxxxxxxxxxxx>: > > Hello, > > Recently, I posted a bug report regarding authentication failures when > pairing with BLE 4.0 devices. I was told to raise this issued to the > Bluetooth mailing lists and I hope this is the correct email to contact. > Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1822633 Could you please also post the HCI log? In a terminal window, execute "sudo btmon" to start logging. Then try to pair your device (reproduce the issue). The btmon tool should now have printed the HCI packets to stdout. /Emil