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

[Guenter Roeck]

On 1/12/20 4:07 AM, Linus Walleij wrote:
> On Sun, Jan 12, 2020 at 1:03 PM Gabriel C <nix.or.die@xxxxxxxxx> wrote:
> > Am So., 12. Jan. 2020 um 12:22 Uhr schrieb Linus Walleij
> > <linus.walleij@xxxxxxxxxx>:
> > > On Sun, Jan 12, 2020 at 12:18 PM Gabriel C <nix.or.die@xxxxxxxxx> wrote:
> > >
> > > > What I've noticed however is the nvme temperature low/high values on
> > > > the Sensors X are strange here.
> > > (...)
> > > > Sensor 1:     +27.9ÂC  (low  = -273.1ÂC, high = +65261.8ÂC)
> > > > Sensor 2:     +29.9ÂC  (low  = -273.1ÂC, high = +65261.8ÂC)
> > > (...)
> > > > Sensor 1:     +23.9ÂC  (low  = -273.1ÂC, high = +65261.8ÂC)
> > > > Sensor 2:     +25.9ÂC  (low  = -273.1ÂC, high = +65261.8ÂC)
> > >
> > > 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:        +23.0ÂC  (low  =  +0.0ÂC, high = +60.0ÂC)
                       (crit low = -41.0ÂC, crit = +85.0ÂC)
                       (lowest = +20.0ÂC, highest = +31.0ÂC)

Guenter