Realtek published a driver using ALSA 1.0.14-4. It seems that they added a new model for medion ("medion-md2"). I tried this model but it doesn't work either on my laptop. I sent them an email to know more about that.

Does anybody has more information ?

I updated the bug report : https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3160

Thanks