I expect the same behaviour here after changing the system hardware from
a nvidia card. I am using a sandy brigde graphics now (xeon) - which is
the case in this bug as well.

  VGA compatible controller: Intel Corporation Xeon E3-1200 Processor
Family Integrated Graphics Controller (rev 09)

If I run

  lightdm --test-mode

with xephyr, I'll get a correct result (the given picture shows up). So
settings seem to be OK:

cat /etc/lightdm/unity-greeter.conf

[greeter]
background=/home/me/.cache/gnome-control-center/backgrounds/05f06bfdd4b978cb282f07ee7b1dc3849215ff85ea6467378e40caa5c3330855
logo=/usr/share/unity-greeter/logo.png
theme-name=Ambiance
icon-theme-name=ubuntu-mono-dark
font-name=Ubuntu 11
xft-antialias=true
xft-dpi=96
xft-hintstyle=hintslight
xft-rgba=rgb

These issues occure with the mainline 11.10 Kernel as the new 3.2.7-ppa
Kernel as well.

So this seems to be a graphics  hardware/driver issue?!

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https://bugs.launchpad.net/bugs/909176

Title:
  black screen after logout using gnome 3.2 lightdm

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