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Description of problem:
Have gdm-greeter with disabled user list (i.e. there's inputbox for username instead of picking username from a list). Inputbox is missing and there's no way to log in. 

Version-Release number of selected component (if applicable):
gnome-shell-3.14.4-52.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. disable gdm-greeter user list
cat >>/etc/dconf/db/gdm.d/01-disable_user_list <<EOGDM
[org/gnome/login-screen]
disable-user-list=true
EOGDM
2. restart Xorg
3. try to log in via gdm

Actual results:
no username inputbox

Expected results:
be able to write username down and log in

Additional info:
gnome-shell-3.14.4-37.el7.x86_64 works fine

Kind of regression / reappearance of bug 1270378 from 7.2 beta.

of all the changes, between -37 and -52 the one most likely to be related is this one:

* Tue Apr 19 2016 Ray Strode <rstrode> - 3.14.4-40•
- Allow timed login with no user list•
  Resolves: #1301263•

is it possible timed login is enabled ?