Thanks for the advice.  I installed 4.7.0-040700.201608021801 and it
doesn't make any difference.

I did discover, though, that with either kernel, if you give
intel_backlight a brightness of 0, the backlight switches off
completely.

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1608745

Title:
  Backlight uncontrollable on Samsung NP740UE3 since upgrade to Xenial

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