If it is of any help: I work on an open source project with UAC2 device and
ASIO driver, both with audio OUT and feedback IN endpoints. All functional.
AFAIK you can use an audio IN endpoint to set the phase as an alternative
to dedicated feedback IN.
On Sunday, February 11, 2018, Robert Bielik <Robert.Bielik@xxxxxxxxx> wrote:
Wait, never mind – I recognize that failing status code. usbaudio2.sys is
complaining that you have an asynchronous data OUT endpoint but it can’t
find a corresponding feedback endpoint.
Thanks Matthew, that explains it. And this is, as of linux 4.15.* not
implemented, there is no feedback endpoint defined in the UAC2 gadget