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 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
