This means that the package maintainer did not override the upstream
decision to exclude NVMe devices from default DEVICESCAN. Here the
related message printed by ./configure if no '--with*-nvme-devicescan'
option is specified:
"
configure: WARNING:
This version of smartmontools provides NVMe support which is still
EXPERIMENTAL. NVMe devices are not yet included in smartd.conf
'DEVICESCAN' and 'smartctl --scan' unless '-d nvme' is specified.
Use option '--with-nvme-devicescan' to include NVMe devices.
Use option '--without-nvme-devicescan' to suppress this warning.
"
Workaround: DEVICESCAN -d sat -d nvme ...
Test with: smartctl --scan -d sat -d nvme
