I tried to modify the variable concerned in the new kernel 5.6.15
(kernel.org). I succeeded.
Consequently, I tried the blow with the sources of the last official
debian 5.6 kernel (5.6.0-2). I arrived too.
thus, configured sources, I obtained the kernel 5.6.14 (5.6.14 - 1)
which I currently run and which does not pose me a problem for the moment.
~$ uname -a
Linux P1-NVME 5.6.14-amd64 #1 SMP Sat May 30 08:23:51 CEST 2020 x86_64
GNU/Linux
the temperature data of the nvme are well recognized in
/sys/class/hwmon/ and lm - sensors .
example :
~$ sensors
... / ...
nvme-pci-0100
Adapter: PCI adapter
Composite: +40.9°C (low = -273.1°C, high = +69.8°C)
(crit = +79.8°C)
Sensor 1: +41.9°C (low = -273.1°C, high = +65261.8°C)
Sensor 2: +40.9°C (low = -273.1°C, high = +65261.8°C)
Sensor 5: +47.9°C (low = -273.1°C, high = +65261.8°C)
... / ...
I wait for the next kernel. hoping that the option, already present, is
configured there and especially active.