#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
echo 0 > /sys/class/backlight/intel_backlight/brightness
# By default this script does nothing.

exit 0


Using the above script from shutdown to boot I am now able to adjusted my 
screen-brightness after login.  From stand by I added the following script to 
/etc/pm/sleep.d (create new file and make it executable)

#!/bin/sh
# to fix backlight issues on resume

case "${1}" in
resume)
echo 0 > /sys/class/backlight/intel_backlight/brightness
;;
esac

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https://bugs.launchpad.net/bugs/954661

Title:
  backlight brightness not adjustable by default on Dell XPS 13

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