Can't use midi keyboard

Hello,

I am trying to use the midi input to enter note in MuseScore, but it doesn't work.
I am using Chakra (Linux) with MuseScore 2.0.0.

If, in a console, I try "cat -A /dev/midi1", and I press key on the keyboard, it is detected (text appear on screen). But, in MuseScore, when pressing a key, nothing happens.
Yes, the midi input is enabled, and I am in Note Entry.

I am note sure what more I need to try.
Thanks.