[LAU] MIDI-controller treated as audio device

[Michael Jarosch]

Hi!

Installed a new kernel on my Debian Testing machine with 
kxstudio-"extension"

:~$ uname -a
Linux mmmaschine 5.9.0-4-rt-amd64 #1 SMP PREEMPT_RT Debian 5.9.11-1 
(2020-11-27) x86_64 GNU/Linux

and had a new problem that jack couldn't launched - which bever had been 
a problem, so far. Dived into journalctl -f and stumbled upon

Dez 04 11:18:17 machine pulseaudio[1852]: E: [pulseaudio] 
module-alsa-card.c: Failed to find a working profile.
Dez 04 11:18:17 machine pulseaudio[1852]: E: [pulseaudio] module.c: 
Failed to load module "module-alsa-card" (argument: "device_id="3" 
name="usb-KORG_INC._KONTROL49-00" 
card_name="alsa_card.usb-KORG_INC._KONTROL49-00" namereg_fail=false 
tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes 
use_ucm=yes avoid_resampling=no 
card_properties="module-udev-detect.discovered=1""): initialization failed.

Knowing, that the Korg has no audio-abilities, I checked

:~$ cat /proc/asound/cards

  0 [PCH            ]: HDA-Intel - HDA Intel PCH
                       HDA Intel PCH at 0x4001110000 irq 134
  1 [Loopback       ]: Loopback - Loopback
                       Loopback 1
  2 [DSP            ]: H-DSP - Hammerfall DSP
                       RME Hammerfall HDSP 9652 at 0xa0100000, irq 17
  3 [KONTROL49      ]: USB-Audio - KONTROL49
                       KORG INC. KONTROL49 at usb-0000:00:14.0-2, full speed

Unplugging the Korg Kontrol49 made it possible to launch jackd, again.

My questions:
How can I force my system not to handle the Korg as an audio but a MIDI 
device?
Is this something happening on kernel level, so *someone*™ has to fix 
stuff here?

Greets!
Mitsch