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Description of problem:
Using the dconf settings, you can enable 'disable-restart-buttons'. GDM login screen doesn't honor that and keeps these 'buttons' available under the top panel menu icon.

Version-Release number of selected component (if applicable):
gnome-shell-3.4.1-5.el7.x86_64
gdm-3.4.1-3.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Create a file /etc/dconf/db/gdm.d/99-site-defaults with this content:

[org/gnome/login-screen/disable-restart-buttons]
active=true

2. Run 'dconf update' under root
3. Restart the GDM session
  
Actual results:
The 'restart buttons' are still available

Expected results:
Possibly the entire power of icon is not present on the top panel

(In reply to comment #0)
> Description of problem:
> Steps to Reproduce:
> 1. Create a file /etc/dconf/db/gdm.d/99-site-defaults with this content:
> 
> [org/gnome/login-screen/disable-restart-buttons]
> active=true

Note that this should read

[org/gnome/login-screen]
disable-restart-buttons=true

It is currently only used in the fallback greeter though, I filed this upstream as https://bugzilla.gnome.org/show_bug.cgi?id=686247.

Fixed upstream in 3.6.1.

If I disable restart button under user, I can still see them in gdm, 

if I set this in /etc/dconf/db/gdm.d/99-site-defaults:
[org/gnome/login-screen/disable-restart-buttons]
active=true

no help

this doesn't work either:
[org/gnome/login-screen]
disable-restart-buttons=true

Indeed, it is not working with gnome-shell 3.8

I've just tested on both Fedora 19 and RHEL 7, and it is working as expected:

# cat > /etc/dconf/db/gdm.d/99-site-settings <<EOT
>[org/gnome/login-screen]
>disable-restart-buttons=true
>EOT
# dconf update
# systemctl restart gdm.service