Re: [PATCH v2] hwmon: Driver for temperature sensors on SATA drives

[Guenter Roeck <linux@roeck-us.net>]

On 1/12/20 4:07 AM, Linus Walleij wrote:
> On Sun, Jan 12, 2020 at 1:03 PM Gabriel C <nix.or.die@gmail.com> wrote:
>> Am So., 12. Jan. 2020 um 12:22 Uhr schrieb Linus Walleij
>> <linus.walleij@linaro.org>:
>>>
>>> On Sun, Jan 12, 2020 at 12:18 PM Gabriel C <nix.or.die@gmail.com> wrote:
>>>
>>>> What I've noticed however is the nvme temperature low/high values on
>>>> the Sensors X are strange here.
>>> (...)
>>>> Sensor 1:     +27.9°C  (low  = -273.1°C, high = +65261.8°C)
>>>> Sensor 2:     +29.9°C  (low  = -273.1°C, high = +65261.8°C)
>>> (...)
>>>> Sensor 1:     +23.9°C  (low  = -273.1°C, high = +65261.8°C)
>>>> Sensor 2:     +25.9°C  (low  = -273.1°C, high = +65261.8°C)
>>>
>>> That doesn't look strange to me. It seems like reasonable defaults
>>> from the firmware if either it doesn't really log the min/max temperatures
>>> or hasn't been through a cycle of updating these yet. Just set both
>>> to absolute min/max temperatures possible.
>>
>> Ok I'll check that.
>>
>> Do you mean by setting the temperatures to use a lmsensors config?
>> Or is there a way to set these with a nvme command?
> 
> Not that I know of.
> 
> The min/max are the minumum and maximum temperatures the
> device has experienced during this power-on cycle.
> 

No, that would be lowest/highest. The above are (or should be) per-sensor
setpoints. The default for those is typically the absolute minimum /
maximum of the supported range.

Some SATA drives report the lowest/highest temperatures experienced
since power cycle, like here.

drivetemp-scsi-5-0
Adapter: SCSI adapter
temp1:        +23.0°C  (low  =  +0.0°C, high = +60.0°C)
                        (crit low = -41.0°C, crit = +85.0°C)
                        (lowest = +20.0°C, highest = +31.0°C)

Guenter