Solved upstream with kernel 4.11 RC1 from Ubuntu kernel archive.
I'm back to 4.23 W instead of 8.26 W in same power conditions.

I reach PC8 power state (powertop) instead of PC3.

Hope the APST Andy's patch (I guess it's the key ?) will be backported
soon to Zesty's kernel.

** Tags added: solved-upstream

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https://bugs.launchpad.net/bugs/1664602

Title:
  Using an NVMe drive causes huge power drain

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