I think I should elaborate on my previous post.

I have 2 entries in /sys/class/backlight 
   acpi_video0
   intel_backlight

When I use the slider in the brightness applet or the hotkeys to change
the brightness, the value of /sys/class/backlight/acpi_video0 is
changing.

This being the case, I believe that if I could point both of those to
/sys/class/backlight/intel_backlight/brightness the problem would be
solved.

This is where I fall down as I do not know how to do this.

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https://bugs.launchpad.net/bugs/1307064

Title:
  Ubuntu 14.04 Beta cannot adjust brightness on Lenovo Ideapad Z570

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