Comment # 5 on bug 914661 from a b

I did
rpm -U mgetty-1.1.36-84.1.x86_64.rpm
* systemctl start mgetty@modem.service  -- never returns

$ systemctl enable mgetty@modem.service
ln -s '/usr/lib/systemd/system/mgetty@.service'
'/etc/systemd/system/getty.target.wants/mgetty@modem.service'


but no mgetty to find with ps

note;
 i have tested /dev/modem by using minicom, it works