I've been having the same problem with my ALSA MIDI connections for a few months now. It makes no difference whether the devices are internal or external. However, applying your "fix" to my system fixed my problem as well. My Jack-MIDI was set to RAW as well, and setting to seq now allows me to connect my ALSA MIDI devices again.
This is strange, as I have not changed my JACK parameters in at least a year....but I have upgraded my Jack, Qtractor and Qjackctl many times in that time frame. I just never mentioned it before because I thought the problem was unique to my system, having not until now seen anyone else experience it. However, sometimes I could make the ALSA MIDI connections, but they would not last long, and disconnected unexpectedly never to reconnect again. I'll let you know if this "fix" holds up.
I've been having the same problem with my ALSA MIDI connections for a few months now. It makes no difference whether the devices are internal or external. However, applying your "fix" to my system fixed my problem as well. My Jack-MIDI was set to RAW as well, and setting to seq now allows me to connect my ALSA MIDI devices again.
This is strange, as I have not changed my JACK parameters in at least a year....but I have upgraded my Jack, Qtractor and Qjackctl many times in that time frame. I just never mentioned it before because I thought the problem was unique to my system, having not until now seen anyone else experience it. However, sometimes I could make the ALSA MIDI connections, but they would not last long, and disconnected unexpectedly never to reconnect again. I'll let you know if this "fix" holds up.
cheers,
Lexridge