Daniel Mack wrote:
>   git clone -b snd-usb git://github.com/zonque/linux.git

> The device complies to the UAC1 standard but hides that fact with
> proprietary descriptors.
>
> +      {
> +        .ifnum = 2,
> +        .type = QUIRK_MIDI_STANDARD_INTERFACE
> +      },

That quirk requires standard descriptors.

For some reason, this device doesn't even have the Roland-specific MIDI
descriptor.  Try this instead:

        {
                .ifnum = 2,
                .type = QUIRK_MIDI_FIXED_ENDPOINT,
                .data = & (const struct snd_usb_midi_endpoint_info) {
                        .out_cables = 0x0001,
                        .in_cables  = 0x0001
                }
        },


Regards,
Clemens

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