Atte André Jensen wrote:
Removing laptop-mode-tools did the trick, now I can
see the notes in gmidimonitor!!!
Please install it again and change /etc/laptop-mode/conf.d/usb-autosuspend.conf
so that your keyboard doesn't get autosuspended.
If the default isn't correct, you should file a bug with laptop-mode-tools.
(Most USB MIDI and many USB audio devices will break when autosuspended.)
Regards,
Clemens