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While seeking a solution to my login background question I realized that the lockscreen has to be configured seperately. But how? On a quick google search I only found the suggestion to replace the images in the Adwaita theme. Is there a better way?

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See for a step by step instruction on how to change each of the three wallpapers on GNOME 3. This article is written for Debian though. – Susam Pal Oct 16 '12 at 4:24
up vote 12 down vote accepted

edit /usr/share/backgrounds/beefy-miracle/default/beefy-miracle.xml,change the picture path which you set as below:

<!-- Wide 16:10 -->
<size width="1920" height="1200">/usr/share/backgrounds/beefy-miracle/default/wide/SundownDunes.jpg</size>
<!-- Standard 4:3 -->
<size width="2048" height="1536">/usr/share/backgrounds/beefy-miracle/default/standard/SundownDunes.jpg</size>
<!-- Normalish 5:4 -->
<size width="1280" height="1024">/usr/share/backgrounds/beefy-miracle/default/normalish/SundownDunes.jpg</size>
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It's not nearly as nice and simple as it should be. I would love to see a UI based tweak tool for this. – Rodja Dec 2 '12 at 3:23

I did a straight replacement of existing images. I have performed other hacks to change the logon wallpaper, but I am guessing that this will also address the logon wallpaper.

Fedora 17 path is: /usr/share/backgrounds/beefy-miracle/default and from there you have /normalish; /standard; /wide and within each is beefy-miracle.png

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This method works, but keep in mind that it will likely create trouble when upgrading to a later release of fedora. – Cobra_Fast Oct 12 '12 at 11:58

i just found that in Fedora 20 (Gnome 3.10) they made a UI for changing the lockscreen background.

go to the settings, and open the background options, there are 2 choices one for the normal background and one for the lockscreen

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