A tentative success story:

Using the patched r8169 driver & powertop tunables set to "GOOD", my CPU
was able to reach the C7 package state. I noticed C7 is only reached
when the laptop is unplugged, otherwise only C3 is reached. I am not
sure if this behavior is expected, but may be leading to the confusion
above.

CPU temperatures seem to idle around 40-60 degrees celsius. This is
slightly higher than Windows 10 (where I checked it at about 40-50
degrees celsius). The fan kicks on every once in a while, but goes away
as expected ~30 seconds later.

I am using Ubuntu 17.10 with the 4.13.0-16-generic kernel.

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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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