Update from my test with ubuntu xenial:
 - installed 16.04.1
 - updated to 4.8.12 
  [my test may not be as useful because of this, but I did not have a lot of 
time, and decided to proceed with latest release]
 - installed nvidia 375.20 and switched to intel graphics
 - replaced grub parameter quiet splash with acpi_osi="!Windows 2015" as 
suggested
 - installed powertop and set tunables to good as suggested

results are the same as my normal setup
 - fans start to run at ~15 min. after boot ( on practically idle ), fans kept 
running until ~1 hr. uptime. ( checked twice, both cases essentially idle )

on the upside, powertop is one additional tool that I can no use to
maybe squeeze out additional couple minutes of battery runtime.

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https://bugs.launchpad.net/bugs/1602888

Title:
  Dell Inspiron 7559 fans do not shut off once started, even when cool

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