According to your Xorg.0.log -intel driver has found a backlight control. Could 
you please post the output of >>ls -l /sys/class/backlight/acpi_video0<<.
You could also try to remove the backlight module. Change to console (ctrl + 
alt + f1) while gdm is running and remove the module with >>rmmod backlight<<. 
Maybe you have to remove a dependent module before. Afterwards restart GDM and 
login. Of course everything with the standard xorg.conf.

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laptop backlight is turning off
https://bugs.launchpad.net/bugs/247315
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