Reference

pchtherm(4)

Intel PCH thermal subsystem

NAME

pchtherm – Intel PCH thermal subsystem

SYNOPSIS

device pci device pchtherm

DESCRIPTION

The pchtherm driver provides access to sensor data and configuration installed in Intel PCH chipset. pchtherm configuration register.

The access to pchtherm data is made via the sysctl(8) interface:

dev.pchtherm.0.ctt: 115.0C
dev.pchtherm.0.temperature: 28.5C
dev.pchtherm.0.t2temp: 91.0C
dev.pchtherm.0.t1temp: 86.0C
dev.pchtherm.0.t0temp: 81.0C
dev.pchtherm.0.tahv: 83.0C
dev.pchtherm.0.talv: 30.0C
dev.pchtherm.0.pmtime: 32
dev.pchtherm.0.pmtemp: 50.0C
dev.pchtherm.0.%parent: pci0
dev.pchtherm.0.%pnpinfo: vendor=0x8086 device=0x9d31 subvendor=0x17aa subdevice=0x2256 class=0x118000
dev.pchtherm.0.%location: slot=20 function=2 dbsf=pci0:0:20:2
dev.pchtherm.0.%driver: pchtherm
dev.pchtherm.0.%desc: Skylake PCH Thermal Subsystem
dev.pchtherm.%parent:
dev.pchtherm.%d.temperature

Is the read-only value of the current temperature read by the sensor.

dev.pchtherm.%d.ctt

When the system reaches this temperature, it will shut down. This will not appear when this feature is disabled and locked down.

dev.pchtherm.%d.t0temp

When temperature is under this value, system will be in T0 state.

dev.pchtherm.%d.t1temp

When temperature is over t0temp and under this value, system will be in T1 state.

dev.pchtherm.%d.t2temp

When temperature is over t1temp and under this value, system will be in T2 state. Over this value, system will be in T3 state.

dev.pchtherm.%d.talv

Lower alart value. This will not appear when sensor enable bit is locked down and the value is zero(which will show -50.0C).

dev.pchtherm.%d.tahv

High alart value. This will not appear when sensor enable bit is locked down and the value is zero(which will show -50.0C).

dev.pchtherm.%d.pmtemp

Sensor Power management temperature. Under this temperature, sensor will idle during pmtime second.

dev.pchtherm.%d.pmtime

Sensor idle duration when low temperature.

dev.pchtherm.%d.pch_hot_level

When temperature is higher than this value, PCHHOT# pin will assert. This value is not appear when this feature is disabled and locked down.

Please check the PCH datasheets for more details.

CAVEATS

All values are read-only. And it do not support event interrupt for now.

SEE ALSO

sysctl(8)

HISTORY

The pchtherm driver first appeared in FreeBSD 13.0.

AUTHORS

The pchtherm driver and this manual page were written by Takanori Watanabe ⟨[email protected]⟩.

History