The bisect reported the following as the first bad commit:

commit a50188dae3089dcd15a6ae793528c157680891f1
Author: Aaron Lu <[email protected]>
Date:   Mon Apr 22 14:08:32 2013 +0200

    acpi: video: enhance the quirk detect logic of _BQC

I built a Trusty test kernel with that commit reverted.  Can you test
this kernel and see if it resolves this bug?  It can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1354710

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https://bugs.launchpad.net/bugs/1354710

Title:
  Backlight control does not work, but there are entries in
  /sys/class/backlight. Lenovo B570

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