I have the same problem with my Acer 5750G.  I find I can control the
brightness by using "echo 200 | sudo tee
/sys/class/backlight/intel_backlight/brightness" and this has a range of
0 to 976.  The key board brighness control and the control in system
settings seem to change the variable loacted at
"/sys/class/backlight/acpi_video0/brightness" that uses a range of 0 to
9.  I dont know where the code is that changes the latter variable.  I
am using Ubuntu 12.04 LTS

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https://bugs.launchpad.net/bugs/853244

Title:
  Acer Aspire 5742Z brightness keys not working

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