[CentOS] CentOS 7.1 user login screen can't scroll up/down

> Isn't there a way to open a box for "other user"?
>
>> 3. Disable the user list:
>> https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Desktop_Migration_and_Administration_Guide/customizing-login-screen.html
>
> This, in fact, *is* the correct answer. That it's enabled is bad.
>
> 1. Security. Having the username, which someone being nasty wants to
>      break into, but doesn't know it, this is just that much easier.
> 2. You have over 100 users. That's annoying to scroll through. Certainly,
>      each user *ought* to know their own username, and it's faster to
>      type it in, than scroll down 5 or so names at a time through 100+.
> 3. See 1.

Good point.  I never liked the user list anyway.  Wonder why the RHEL 7 
designers chose to add it?

/Ole