Arch Linux

Description:
When using archlinux-themes-kdm (simplyblack and soft-grey) while logging into KDE I get weird artifacts in the background.
They consist of parts of images displayed before logging out - it looks like a big mess of previously displayed pictures.

Here is solution for exactly the same problem (although the theme is different):
http://forums.opensuse.org/hardware/64-bit/412685-nvidia-scrambled-kdm-background-login-splash.html#post1974101

I have tried it with archlinux-themes-kdm, and it works.
In both files, archlinux-simplyblack/kdm.xml and archlinux-soft-grey/kdm.xml first pixmap entry needs to be modified.
Instead of:
<!-- background -->
<item type="pixmap">
<normal file="background.png"/>
<pos x="0" y="0" width="100%" height="100%"/>
</item>
There should be:
<!-- background -->
<item type="pixmap" id="background" background="true">
<normal file="background.png"/>
<pos x="0" y="0" width="100%" height="100%"/>
</item>

( ' id="background" background="true" ' needs to be added to <item> )

This works great, the mess doesn't show up anymore.