MIDI keyboard recognized on lsusb, but doesn't work

Question

The other day I decided I might try to make some music on Ubuntu 18.04. I have a synthesizer that can work on its own, but it can also send an receive MIDI, namely a Novation MiniNova.
So I downloaded LMMS from the Software Store, created a tune in it without the use of the keyboard. Up until this point, no problems.

Now, when I plugged in my MiniNova, I expected to just run a few commands and be done with it. How wrong could I be. LMMS didn't recognize my keyboard, neither did KMidiMon. I followed this guide by a bloke named Ted and followed every step closely up until the point where I had to run cat /proc/asound/cards to figure out what ALSA named my sound card. I used sox to generate a 440 Hz sine .wav file, then I typed aplay -D hw:1 test.wav and I heard the sine wave through my laptops speakers.
lsusb gave me the MiniNova in the list, but adding the verbose option told me that it Couldn't open the device, some information missing.which seems weird to me.

I did come across a weird little thing when I decided that it couldn't hurt to run LMMS through a terminal. When I did, I got the following result:

ALSA lib rawmidi_hw.c:233:(snd_rawmidi_hw_open) open /dev/snd/midiC0D0 failed: No such file or directory
cannot open MIDI-device: No such file or directory
Couldn't create MIDI-client, neither with ALSA nor with OSS. Will use dummy-MIDI-client.
Connection established.

Stream successfully created

MidiClientRaw: unhandled MIDI-event 176

MidiClientRaw: unhandled MIDI-event 176

MidiClientRaw: unhandled MIDI-event 176

The last three messages were after opening the project I had been working on.

If it's helpful, here are links to my results after typing:

• aplay -l
• cat /proc/asound/cards

Thanks in advance, WalrusGumboot

Answer 1

Linux does not (yet) support this device; you have to build your own kernel. You do not need to make any configuration changes, but instead edit the file sound/usb/quirks-table.h, and add the following entry anywhere:

{
    USB_DEVICE(0x1235, 0x001e),
    .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
        .ifnum = 0,
        .type = QUIRK_MIDI_RAW_BYTES
    }
},