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On Wednesday 23 Aug 2017 12:23:00 Clemens Ladisch wrote:
Keith A. Milner wrote:
It seems to open and close the PCMs
That happens due to requests from user space, probably PulseAudio.
kernel: [ 1987.452947] usb 1-1: Unable to change format on ep #8e: already in use
So this is a Roland device? Playback-synchronized-to-capture is a very special case; at the moment, nobody understands this code completely.
But the problem for this device might be that it requires some vendor-specific messages to enable it in the first place.
That's very useful, thank you. I forgot about pulseaudio!
So the error messages are due to a userspace app trying to open playback and capture at the same time? Or is it just a generic driver/card issue when trying to open the interface?
I have the ability to sniff the USB whilst running on Windows. For this specific device I may try that.
Regards,
Keith