I would like to add that this bug also affects 256GB versions of the Samsung 
NVMe drives.
The  quirk has been added for the 512GB, can we also have one added for the 
256GB?

Here is my output of nvme-cli

**
nvme list

Node             SN                   Model                                    
Version  Namespace Usage                      Format           FW Rev  
---------------- -------------------- ---------------------------------------- 
-------- --------- -------------------------- ---------------- --------
/dev/nvme0n1           S29NNXAGC38399 PM951 NVMe SAMSUNG 256GB                 
1.1      1         201.30  GB / 256.06  GB    512   B +  0 B   BXV77D0Q



nvme id-ctrl /dev/nvme0n1

NVME Identify Controller:
vid     : 0x144d
ssvid   : 0x144d
sn      :       S29NNXAGC38399
mn      : PM951 NVMe SAMSUNG 256GB                
fr      : BXV77D0Q
rab     : 2
ieee    : 002538
cmic    : 0
mdts    : 5
cntlid  : 1
ver     : 0
rtd3r   : 0
rtd3e   : 0
oaes    : 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
sqes    : 0x66
cqes    : 0x44
nn      : 1
oncs    : 0x1f
fuses   : 0
fna     : 0
vwc     : 0x1
awun    : 255
awupf   : 0
nvscc   : 1
acwu    : 0
sgls    : 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:-

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https://bugs.launchpad.net/bugs/1678184

Title:
  APST quirk needed for Samsung 512GB NVMe drive

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