systemctl status mgetty@ttyS6 mgetty@ttyS6.service - mgetty on /dev/ttyS6 Loaded: loaded (/usr/lib/systemd/system/mgetty@.service; enabled) Active: active (running) since Mo 2015-01-26 15:23:39 UTC; 54s ago Docs: man:mgetty(8) Main PID: 17622 (mgetty) CGroup: /system.slice/system-mgetty.slice/mgetty@ttyS6.service ������17622 /usr/sbin/mgetty /dev/ttyS6 ttyS6 works for me. why is the symlink to /dev/modem a problem ?