Pauli, > Thanks for testing! What userspace software did you use? Pulseaudio at > least I think had assumption that mtu <= 60, which breaks here > (Pipewire works, don't know about bluez-alsa). If otherwise, maybe it > then needs also the manufacturer flag. I am using Pipewire 0.3.32. When I wrote "this adapter (...) reports an SCO MTU of 96 bytes" in my previous message, I meant that this was the value present in hdev->sco_mtu around the problematic code location. If this was the wrong thing to take a look at, please let me know. -- Best regards, Michał Kępień