Here's the thread from ubuntu forums where this has been disscussed 
http://ubuntuforums.org/showthread.php?t=2181534. 
Christopher, This is more than an issue with the B570 as this is happening to 
most computers with Intel Graphics. The workaround is written here 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1244645/comments/4 as all 
it does is load an x11 module for the Intel Backlight device wich for some 
reason is not loaded upon installation by default.

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https://bugs.launchpad.net/bugs/1244645

Title:
  8086:0106 [Lenovo B570] Brightness is at 100 percent and will not
  change

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