Comment 101 for bug 1678184

I'd like to follow-up on this bug - it affects me using kernel 4.19.0 on a Dell XPS 9550 with a 1TB Samsung drive. Details below. Do I need to open a new bug as I've got a 1TB drive and this bug report was opened for a 512GB drive?

$ uname -a
Linux ian-XPS-15-9550 4.19.0-041900-generic #201810221809 SMP Mon Oct 22 22:11:45 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

$ cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-4.19.0-041900-generic root=/dev/mapper/mint--vg-root ro quiet splash vt.handoff=1

$ sudo nvme list
Node SN Model Namespace Usage Format FW Rev
---------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
/dev/nvme0n1 S2FZNYAG801690 PM951 NVMe SAMSUNG 1024GB 1 314.10 GB / 1.02 TB 512 B + 0 B BXV76D0Q

A few weeks back I reformatted my machine due to Dropbox's requirement to drop encrypted home folders (I went for full-disk encryption). I'm using Linux Mint 19.0. I used to run kernel 4.9.91, I had to stick to that in my previous machine's Mint installation as >4.9.91 had boot issues (e.g. missing firmware for my wifi) and going 4.10+ caused other issues including, from memory, strange disk issues that I didn't track down along with occasional GPU+second screen issues. I was keen to upgrade to 4.10+ but sticking to 4.9.91 gave me a stable machine. I'm keen to push on now that I'm running on a fresh installation.

Having installed Mint 19.0 and upgraded to 4.19.0 I was happy that everything worked...until left idle for a while when I got similar errors to the ones noted here:
Oct 31 11:33:04 ian-XPS-15-9550 kernel: EXT4-fs (dm-1): mounted filesystem with ordered data mode. Opts: (null)
Oct 31 11:33:04 ian-XPS-15-9550 kernel: EXT4-fs (dm-1): re-mounted. Opts: errors=remount-ro
Oct 31 11:33:05 ian-XPS-15-9550 kernel: EXT4-fs (nvme0n1p1): mounted filesystem with ordered data mode. Opts: (null)
Oct 31 15:09:44 ian-XPS-15-9550 kernel: EXT4-fs (dm-1): mounted filesystem with ordered data mode. Opts: (null)
Oct 31 15:09:44 ian-XPS-15-9550 kernel: EXT4-fs (dm-1): re-mounted. Opts: errors=remount-ro
Oct 31 15:09:44 ian-XPS-15-9550 kernel: EXT4-fs (nvme0n1p1): mounted filesystem with ordered data mode. Opts: (null)

After this state the machine would be unusable due to a read-only filesystem.

So far I've only exprerimented with disabling APSTE (using: `sudo nvme set-feature -f 0x0c -v=0 /dev/nvme0`) - if I do this after every awaken from suspend then I'm able to use the laptop for over a week without issues with many suspended sessions. If I forget to disable APSTE after awakening from suspend then I lose the hard-drive to a read-only state in 1-2 hours depending on usage.

I'm going to start experimenting with adding the grub boot parameter to try different values starting with `nvme_core.default_ps_max_latency_us=250`. I figured opening up this report and taking guidance on what you'd need and whether I needed a new bug report would get the ball rolling.

Much obliged! Ian.

Note that the following command was run after I disabled APSTE, I'm not sure if the results vary before/after settting APSTE, I can re-run it if that's useful after a fresh boot:

$ sudo nvme id-ctrl /dev/nvme0
NVME Identify Controller:
vid : 0x144d
ssvid : 0x144d
sn : S2FZNYAG801690
mn : PM951 NVMe SAMSUNG 1024GB
fr : BXV76D0Q
rab : 2
ieee : 002538
cmic : 0
mdts : 5
cntlid : 1
ver : 0
rtd3r : 0
rtd3e : 0
oaes : 0
ctratt : 0
oacs : 0x17
acl : 7
aerl : 3
frmw : 0x6
lpa : 0
elpe : 63
npss : 4
avscc : 0x1
apsta : 0x1
wctemp : 0
cctemp : 0
mtfa : 0
hmpre : 0
hmmin : 0
tnvmcap : 0
unvmcap : 0
rpmbs : 0
edstt : 35
dsto : 0
fwug : 0
kas : 0
hctma : 0
mntmt : 0
mxtmt : 0
sanicap : 0
hmminds : 0
hmmaxd : 0
sqes : 0x66
cqes : 0x44
maxcmd : 0
nn : 1
oncs : 0x1f
fuses : 0
fna : 0
vwc : 0x1
awun : 255
awupf : 0
nvscc : 1
acwu : 0
sgls : 0
subnqn :
ioccsz : 0
iorcsz : 0
icdoff : 0
ctrattr : 0
msdbd : 0
ps 0 : mp:6.00W operational enlat:5 exlat:5 rrt:0 rrl:0
          rwt:0 rwl:0 idle_power:- active_power:-
ps 1 : mp:4.20W operational enlat:30 exlat:30 rrt:1 rrl:1
          rwt:1 rwl:1 idle_power:- active_power:-
ps 2 : mp:3.10W operational enlat:100 exlat:100 rrt:2 rrl:2
          rwt:2 rwl:2 idle_power:- active_power:-
ps 3 : mp:0.0700W non-operational enlat:500 exlat:5000 rrt:3 rrl:3
          rwt:3 rwl:3 idle_power:- active_power:-
ps 4 : mp:0.0050W non-operational enlat:2000 exlat:22000 rrt:4 rrl:4
          rwt:4 rwl:4 idle_power:- active_power:-