Hi JenniferHodgon,

I had the same bug as you and I have just resolved it following these
steps:

Creating the file /usr/share/X11/xorg.conf.d/80-backlight.conf and
filling it with:

Section "Device"
    Identifier  "Intel Graphics"
    Driver      "intel"
    Option      "AccelMethod"     "sna"
    Option      "Backlight"       "intel_backlight" # use your backlight that 
works here
    BusID       "PCI:0:2:0"
EndSection

Bassically, I have followed the steps described in the section "For the
Intel HD Graphic Controllers" from
https://wiki.ubuntu.com/Kernel/Debugging/Backlight (this link was
reported by you, thanks ;) )

Good luck,
Carlos
Cheers

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https://bugs.launchpad.net/bugs/1214148

Title:
  [Toshiba Portege Z935-ST4N03] Intel video: Display backlight cannot be
  changed

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