In that case it's enabled again:

$ dmesg | grep -i nvme
[    0.000000] Command line: 
BOOT_IMAGE=/boot/vmlinuz-4.10.0-24-generic.efi.signed 
root=UUID=365f1a9c-9598-4ad5-a387-d02f771767a1 ro quiet splash 
nvme_core.default_ps_max_latency_us=0 nvme_core.dyndbg=+p vt.handoff=7
[    0.000000] Kernel command line: 
BOOT_IMAGE=/boot/vmlinuz-4.10.0-24-generic.efi.signed 
root=UUID=365f1a9c-9598-4ad5-a387-d02f771767a1 ro quiet splash 
nvme_core.default_ps_max_latency_us=0 nvme_core.dyndbg=+p vt.handoff=7
[    2.372993] nvme nvme0: pci function 0000:04:00.0
[    2.587597]  nvme0n1: p1 p2
[    3.343336] EXT4-fs (nvme0n1p2): mounted filesystem with ordered data mode. 
Opts: (null)
[    3.548268] EXT4-fs (nvme0n1p2): re-mounted. Opts: errors=remount-ro

sudo nvme get-feature -f 0x0c -H /dev/nvme0
get-feature:0xc (Autonomous Power State Transition), Current value:0x000001
        Autonomous Power State Transition Enable (APSTE): Enabled

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https://bugs.launchpad.net/bugs/1699004

Title:
  APST gets enabled against explicit kernel option

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