Cannot access to cdrom

I create user “kodi” in order to autologin kodi on my lubuntu 16.10 box (Kodi is 17.0 Release Candidate). But when I insert a disc (dvd or blu ray) kodi doesn’t show the disc. If I exit to kodi, login as a normal user and launch kodi, everything is ok ( I can see thew disc). “kodi” user is a member of cdrom group. How can I solve this problem? Thanks in advance