SAMD21 enumerating on MacOS, not on Linux

[romix123]

trafficstars

I have built a MIDI controller based on a Samd21 (Adafruit qt-py bootloader). It enumerates correctly on MacOS and notes, CC and PC messages come through correctly. The board does not work on linux hosts ((monome norns, rsta/minisynth, bare linux). The test code on the main lib page “ execute aseqdump -l; the output will be something similar to

Port Client name Port name 0:0 System Timer 0:1 System Announce 14:0 Midi Through Midi Through Port-0 20:0 Arduino Micro Arduino Micro MIDI 1”

only produces the 2 system lines. What’s up?