pchtherm(4)

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
-nosplit The pchtherm driver and this manual page were written by Takanori Watanabe <takawata@FreeBSD.org>.