I have a couple of MIDI keyboards and helped one or two other people with theirs. But I don't remember an Akai MPK Mini. I never had any trouble getting any of mine to connect to LMMS 1.1.3 or later RC versions so that doesn't really help..
All I can think of to ask is the usual...what version of Windows and what version of LMMS are you trying. Also what LMMS instrument are you trying to connect it to. Some things like SampleTrack and Beat/Basslines just don't accept MIDI. But I just tried my M_Audio with LMMS RC7 x64 and it's fine. I did have a puzzled minute or two until I remembered that LMMS doesn't like you hot-plugging MIDI devices. The keyboard should be plugged in BEFORE you start LMMS or it may not find it. But I doubt if any of that helps.
Steve
All I can think of to ask is the usual...what version of Windows and what version of LMMS are you trying. Also what LMMS instrument are you trying to connect it to. Some things like SampleTrack and Beat/Basslines just don't accept MIDI. But I just tried my M_Audio with LMMS RC7 x64 and it's fine. I did have a puzzled minute or two until I remembered that LMMS doesn't like you hot-plugging MIDI devices. The keyboard should be plugged in BEFORE you start LMMS or it may not find it. But I doubt if any of that helps.
Steve