I think with the help of pipewire team I found where is the problem. executing "bluetoothctl trust 90:06:28:B6:B1:B6" solves two problems : - I get again A2DP - i can connect the smartphone from the PC and not only from the smartphone. I must experiment to found where the problem is. Normaly when pairing a device then the device is automatically in the state "trust". When pairing with the plasma widget I checked this is the case. The plasma widget indicates the state "trust"