Linux System Fedora 25

According to the manual GDM is supposed to run the four scripts
/etc/gdm/Init/Default
/etc/gdm/PostLogin/Default
/etc/gdm/PreSession/Default
/etc/gdm/PostSession/Default
in that order at the appropriate times.


Problems....

1/ Init/default script is not being run at all!

2/ while in other scripts the DISPLAY and XAUTHORITY environment settings are set to empty strings!  In other words... Useless!

Testing...
Added this script to each script, at bottom...

( echo "/etc/gdm/Init/Default on `date +'%F_%T'`"
  env
  echo "==================================================================="
) >>/var/tmp/gdm_env.txt 2>&1
exit 0

Set up log file (ensure writable by anyone)

touch /var/tmp/gdm_env.txt
chmod 666 /var/tmp/gdm_env.txt


Example logged output...

/etc/gdm/PostLogin/Default on 2017-06-07_09:20:15
SHELL=/bin/bash
USER=anthony
USERNAME=anthony
PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin
PWD=/
SHLVL=1
HOME=/home/anthony
LOGNAME=anthony
DISPLAY=
RUNNING_UNDER_GDM=true
XAUTHORITY=
_=/usr/bin/env
===================================================================



ASIDE: I am doing this because I can't see the GDM login as it appears on the LCD screen of my closes laptop, rather than the monitor.  I can login, just can't see the login prompts.  I want to switch the display from a 'stacked vertically' ot a 'cloned display' setup.  Othe rsolutions on the web does