[CentOS] Changing gdm background

Wed Jul 16 17:46:58 UTC 2014
Phoenix, Merka <merka.phoenix at hp.com>

> On 07/15/2014 08:11 AM, Jim Perrin wrote:
> > 
> > You probably want to read over ->
> > 
> > https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Desktop_Migration_and_Administration_Guide/customizing-login-screen.html 
> > 
> > and
> > 
> > https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Desktop_Migration_and_Administration_Guide/customize-desktop-backgrounds.html#setting-default-background 
> > 
> > Essentially you just need to jam the right voodoo in a local dconf 
> > config file and 'dconf update'.
>
> Actually, the first paragraph at your first link says:
>
>   ....  Note that the login screen background image cannot be
>   customized.
>
> Pretty unbelievable.  Hopefully kdm, lightdm, sddm, or even xdm will pop up in EPEL soon.

Searching on Google turns up this:

http://www.webupd8.org/2012/11/how-to-customize-gdm-36-login-lock.html

and states that:
==>
You can manually change the GDM 3.6 grey background image. The image used by default is located under /usr/share/gnome-shell/theme/ and is called noise-texture.png.

Like its name says, the grey image used by GDM 3.6 is a pattern, but you don't have to use a pattern and a regular wallpaper image works too. To change it, open Nautilus [or Dolphin file manager] as root:

gksu "nautilus --no-desktop /usr/share/gnome-shell/theme/"

then make a backup of the original "noise-texture.png" image and replace it with the image you want to use as a background for the GDM 3.6 login / lock screen.
<==

Cheers!

Simba
Engineering