Use of MIDI keyboard in Ubuntu

Same problem here on Archlinux, only lists "no device" for both input and output.

I'm also having this problem. I'm on Arch Linux, using MuseScore 4.0, and trying to connect VMPK to MuseScore for note input. My system is using PulseAudio and I get the following output from aconnect:

% aconnect -i
client 0: 'System' [type=kernel]
    0 'Timer           '
    1 'Announce        '
client 14: 'Midi Through' [type=kernel]
    0 'Midi Through Port-0'
client 129: 'VMPK Output' [type=user,pid=1950590]
    0 'out             '
% aconnect -o
client 14: 'Midi Through' [type=kernel]
    0 'Midi Through Port-0'
client 128: 'VMPK Input' [type=user,pid=1950590]
    0 'in              '

So it would seem that VMPK exposes itself as a MIDI device to ALSA, but MuseScore does not.

Historically I have used JACK and I saw another report that this is removed for now in MuseScore 4.0. But the documentation and UI don't tell me what MIDI backend is actually being used on Linux now, so I have no idea how to set it up! Do I have to use Pipewire or something instead? How can I get MuseScore to see my ALSA MIDI devices?

Same error for me. Tried with pipewire and without on linux mint 21.2

aconnect -i
client 0: 'System' [type=kernel]
0 'Timer '
1 'Announce '
client 14: 'Midi Through' [type=kernel]
0 'Midi Through Port-0'
client 32: 'masterkey 49' [type=kernel,card=4]
0 'masterkey 49 MIDI 1'

How do I submit merge request, or patch? Error looks to be a pretty simple to fix https://github.com/musescore/MuseScore/blob/master/src/framework/midi/i…
port capabilities should be read insted of write

SND_SEQ_PORT_CAP_SUBS_READ | SND_SEQ_PORT_CAP_READ

I've attached a patch, tested on linux mint 21.2 on commit 01139e235fdaf189bca76faa017b6d32a3040c6e

See https://github.com/musescore/MuseScore/pull/19717

Automatically closed -- issue fixed for 2 weeks with no activity.