I can also confirm this bug still exists in 12.04:
also with gdm 3.0.4-0ubuntu15
Uname: Linux 3.2.0-39-generic-tuxonice
Architecture: i386
I needed to set autologin to False in /etc/gdm/custom.conf
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I'm here to say that on ubuntu 12.10, gnome shell 3.6.2 this still not
works. Kind of a pitty..
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https://bugs.launchpad.net/bugs/521492
Title:
[Patch upstream] Dual Monitor wallpaper