Verified on 4.4.0-117-generic, APST was enabled.

#sudo nvme get-feature -f 0x0c -H /dev/nvme0n1

get-feature:0x0c (Autonomous Power State Transition), Current value: 0x000001
        Autonomous Power State Transition Enable (APSTE): Enabled
        Auto PST Entries        .................
        Entry[ 0]   
        .................
        Idle Time Prior to Transition (ITPT): 1500 ms
        Idle Transition Power State   (ITPS): 3
        .................
        Entry[ 1]   

** Attachment added: "nvme-get-feature.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1664602/+attachment/5087978/+files/nvme-get-feature.log

** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

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

Title:
  Using an NVMe drive causes huge power drain

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