Hi @Nils,

Could you please test the Zesty kernel that's currently in proposed

Thank you.

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  APST gets enabled against explicit kernel option

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Yakkety:
  Won't Fix
Status in linux source package in Zesty:
  Fix Committed

Bug description:
  The NVMe driver doesn't set APSTE on APST quirked devices at initialization. 
If the BIOS or NVMe enables APST before driver loading, APST will never be 
disabled, it also ignores explicit kernel option as result.
  So the faulty NVMe may not work as intended. 

  [Test Case]
  $ sudo nvme get-feature -f 0x0c -H /dev/nvme0
  ...will show APST is "Disabled" instead of "Enabled"

  [Regression Potential] 
  Very low.
  This SRU didn't change anything really - it just explicitly set APSTE at 


  I have a Lenovo ThinkPad X270 with a Toshiba nvme SSD

  $ sudo nvme list
  Node             SN                   Model                                   
 Namespace Usage                      Format           FW Rev
  ---------------- -------------------- 
---------------------------------------- --------- -------------------------- 
---------------- --------
  /dev/nvme0n1     177S10WYTAMT         THNSF5256GPUK TOSHIBA                   
 1         256.06  GB / 256.06  GB    512   B +  0 B   51025KLA

  I was affected by this bug
  before. After disabling APST by adding 
"nvme_core.default_ps_max_latency_us=0" in /etc/default/grub, the bug went away.

  Since yesterday, however the bug has returned, with the system dying
  with I/O errors after an hour or so.

  I verified, that the kernel option is still being set

  $ cat /proc/cmdline
root=UUID=365f1a9c-9598-4ad5-a387-d02f771767a1 ro quiet splash 
nvme_core.default_ps_max_latency_us=0 vt.handoff=7

  however it turns out that it is being ignored for some reason, and

  $ sudo nvme get-feature -f 0x0c -H /dev/nvme0

  reports that APST is enabled. I can successfully disable it manually

  $ sudo nvme set-feature -f 0x0c -v=0 /dev/nvme0

  and the problem goes away. However, after any reboot and even after
  waking the system from suspend, it is reenabled, causing the system to
  crash after a short while.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: linux-image-4.10.0-22-generic 4.10.0-22.24
  ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15
  Uname: Linux 4.10.0-22-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4.1
  Architecture: amd64
   /dev/snd/pcmC0D0p:   maeher     1669 F...m pulseaudio
   /dev/snd/controlC0:  maeher     1669 F.... pulseaudio
  CurrentDesktop: Unity:Unity7
  Date: Mon Jun 19 23:29:31 2017
  InstallationDate: Installed on 2017-04-17 (64 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  MachineType: LENOVO 20HN001RUS
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-22-generic.efi.signed 
root=UUID=365f1a9c-9598-4ad5-a387-d02f771767a1 ro quiet splash 
nvme_core.default_ps_max_latency_us=0 vt.handoff=7
   linux-restricted-modules-4.10.0-22-generic N/A
   linux-backports-modules-4.10.0-22-generic  N/A
   linux-firmware                             1.164.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/16/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R0IET30W (1.08 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20HN001RUS
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.product.name: 20HN001RUS
  dmi.product.version: ThinkPad X270
  dmi.sys.vendor: LENOVO

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