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

[Liam O'Toole]

On 2015-04-09, Ole Holm Nielsen
<Ole.H.Nielsen at fysik.dtu.dk> wrote:
> After we upgraded our CentOS 7.0 desktops to CentOS 7.1, a critical
> error in the graphical login screen has appeared on all 7.1 machines:
>
> We have 100+ users defined in /etc/passwd, and a list of names is
> presented on the initial login screen.  However, it's impossible to
> scroll up or down in this user list to select the desired user.  The
> middle mouse button seems to be disabled, so scrolling has become
> impossible!  One can use the left and right mouse buttons to select
> one of the users in view, but no one else.
>
> This seems definitely to be a critical bug in CentOS 7.1.
>
> Workarounds:
>
> 1. Log in non-graphically using Ctrl-Alt-F2, then run the command
> startx.
>
> 2. Trim down /etc/passwd to 1 (or a few) relevant users.
>

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

-- 

Liam