why I installed it successfully? but my virtualbox fedora26 can't boot to screen? about displaylink-rpm HOT 4 CLOSED

it show
'''
Started command Scheduler.
Started Job spooling tools
Starting Hold until boot process finished up...
'''

then it is stop to boot to screen and freeze into this scene

from displaylink-rpm.

I delete the virtualbox machine and create another one , like before I install this rpm
but this time ,
I use grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg to generate grub.cfg
then the virtualbox machine can boot to screen ,and everything is all right
ps -a | grep displaylink
it show
'''
2539 pts/0 S+ 0:00 grep --color=auto displaylink
'''
why?

from displaylink-rpm.

Thanks fof your great jobs!
When I install it to my real PC, it's all right.
but another question,It can't start when I login to the system,I need to use the command.
systemctl start displaylink.service, and login out and then login again ,so it can works!
how to set ? let it auto start when I login to my system?
I have tried systemctl enabled diskplaylink.service ,but it can't, it said diskplaylink doesn't support it

from displaylink-rpm.

The command should be systemctl enable displaylink.service. Hope it works.

from displaylink-rpm.