Hi Felipe,

> Indeed, that's also mandated by USB spec. Seems like we need to patch
> f_uac2.c. Can you check if setting the IN endpoint as implicit feedback
> data is enough?

Just tried your proposed patches on 4.15.1 (with an RPi Zero) and with g_audio, 
unfortunately there is no change. Device is still not recognized, and having 
the same error code.

So, a real feedback IN endpoint is needed ☹


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