Thanks for looking into this. The solid-state–memory device in question is 
Samsung SSD 970 EVO 1TB, S/N:…, FW:2B2QEXE7, 1.00 TB. It's no longer sold on 
samsung.com but still sold as new on amazon (ASIN B07CGJNLBB; the Web site says 
it has been sold there since April 24, 2018). So yes, given the dates in 
https://en.wikipedia.org/wiki/NVM_Express#Specifications 
https://en.wikipedia.org/wiki/NVM_Express#Specifications, the drive might be 
aware of the NVMe 1.2 or 1.3 specification but, again hypothetically, not 1.4 
or even 2.0. I wouldn't know how to check this, and firmware upgrades seem 
unavailable ( https://semiconductor.samsung.com/consumer-storage/support/tools/ 
http://semiconductor.samsung.com/consumer-storage/support/tools/ mentions the 
same version 2B2QEXE7). Just in case this helps, the motherboard is Asus WS 
C422 PRO/SE.
Here is some debugging data:
$ sudo nvme error-log -e 2 /dev/nvme0
Error Log Entries for device:nvme0 entries:2
.................
Entry[ 0]
.................
error_count     : 1885
sqid            : 0
cmdid           : 0x14
status_field    : 0x2002(Invalid Field in Command: A reserved coded value or an 
unsupported value in a defined field)
phase_tag       : 0
parm_err_loc    : 0xffff
lba             : 0
nsid            : 0
vs              : 0
trtype          : The transport type is not indicated or the error is not 
transport related.
cs              : 0
trtype_spec_info: 0
.................
Entry[ 1]
.................
error_count     : 0
sqid            : 0
cmdid           : 0
status_field    : 0(Successful Completion: The command completed without error)
phase_tag       : 0
parm_err_loc    : 0
lba             : 0
nsid            : 0
vs              : 0
trtype          : The transport type is not indicated or the error is not 
transport related.
cs              : 0
trtype_spec_info: 0
.................
$ sudo nvme list
Node                  Generic               SN                   Model          
                          Namespace Usage                      Format           
FW Rev
--------------------- --------------------- -------------------- 
---------------------------------------- --------- -------------------------- 
---------------- --------
/dev/nvme0n1          /dev/ng0n1            Anonymized S.N.      Samsung SSD 
970 EVO 1TB                  1         135,04  GB /   1,00  TB    512   B +  0 
B   2B2QEXE7
$ sudo nvme error-log -e 2 /dev/nvme0
Error Log Entries for device:nvme0 entries:2
.................
Entry[ 0]
.................
error_count     : 1885
sqid            : 0
cmdid           : 0x14
status_field    : 0x2002(Invalid Field in Command: A reserved coded value or an 
unsupported value in a defined field)
phase_tag       : 0
parm_err_loc    : 0xffff
lba             : 0
nsid            : 0
vs              : 0
trtype          : The transport type is not indicated or the error is not 
transport related.
cs              : 0
trtype_spec_info: 0
.................
Entry[ 1]
.................
error_count     : 0
sqid            : 0
cmdid           : 0
status_field    : 0(Successful Completion: The command completed without error)
phase_tag       : 0
parm_err_loc    : 0
lba             : 0
nsid            : 0
vs              : 0
trtype          : The transport type is not indicated or the error is not 
transport related.
cs              : 0
trtype_spec_info: 0
.................
As you see, the output is slightly different from that in 
https://github.com/linux-nvme/libnvme/issues/550 
https://github.com/linux-nvme/libnvme/issues/550, and `nvme list` does not 
increase error_count (or at least not directly). If there's anything else I can 
help with, please let me know.
Gratefully,
AlMa

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