/etc/kde4/kdm/Xsetup is in kdm 4:4.11.13-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #! /bin/sh
# Xsetup - run as root before the login dialog appears
#xconsole -geometry 480x130-0-0 -notify -verbose -fn fixed -exitOnFail -file /dev/xconsole &
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