After much consideration I have finally decided to buy Dell 7566 - a
Skylake 6700hq version (a successor of 7559 model).

I am running Debian testing (Stretch) with kernel 4.8.0.2 with nouveau
driver. After testing it for  while I can now confidently say that in
this configuration the 7566 model is not plagued by the fan issue - out
of the box, lm-sensors show CPU operating temperature between 35 and 45
C with 0 RPM for fans on normal "office" workload. Fans only kick in
when CPU temp exceeds 60 C and stop almost immediately once temperature
drops below 50 - 55 C. Originally I suspected CPU fan sensor was not
working correctly as it was constantly showing 0 rpm. I had to actually
run some Android studio application build which taxes CPU fairly, to get
the fans running. They ran for about 1 minute between 1500 - 2500 rpm
and stopped almost immediately after the build had finished. The battery
life is about the same in Win10 and Linux - approximately 6 hours on
normal workload.

I even have the sleep function working out of the box and install works
without any problems (with the safe boot turned off).

I don't know if this helps anyone, but if there are any potential buyers
around here seeking information, I believe it is safe to say that 7566
is a safe bet with Linux.

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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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