I am testing the Linus GIT development kernel.  Currently, my kernel build is 
3.18.0-rc5+.
With this kernel, I get the following:

root@Wobbly:~# echo 938 > /sys/class/backlight/intel_backlight/brightness
bash: echo: write error: Invalid argument

root@Wobbly:~# echo 937 >
/sys/class/backlight/intel_backlight/brightness

As you can see, 937 is the highest value that does not give an error.

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https://bugs.launchpad.net/bugs/1392101

Title:
  Brightness controls not working on intel igfx

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