As the topic titles states I got a second hand midi keyboard.
Connecting it was very easy. Just plug it in.
openSUSE does not recognize it, but that not a problem.
( Nor does windows btw )
I wanted to use it with LMMS, and LMMS did recognize it.
( Also on windows ) rotfl!
Because it did not work at first on Linux, I booted w7 to see if it was working there.
Then I noticed the problem, the usb connector on the midi keyboard, is not working 100% any more.
I needed to fiddle a little.
I found on the web, a new connector I could solder in.
For those looking for midi keyboards this one works on Linux too ( at least in lmms )
M-AUDIO - Keystation 49es - 49-Key Synth-Action USB Controller
These type of keyboards do not produce any sounds by them self.
You need to connect them to a pc or a midi device to have sounds.
LMMS - Linux MultiMedia Studio
You can install this through yast.
You do not need a midi keyboard to use lmms, it works fine without one too.