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pchtherm(4) FreeBSD Kernel Interfaces Manual 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. 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 <takawata@FreeBSD.org>. FreeBSD 14.0-RELEASE-p11 March 15, 2020 FreeBSD 14.0-RELEASE-p11