Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
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 in-
     stalled 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 tem-
				    perature 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, sys-
				    tem	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.  Un-
				    der	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 <takawata@FreeBSD.org>.

FreeBSD	13.0			March 15, 2020			  FreeBSD 13.0

NAME | SYNOPSIS | DESCRIPTION | CAVEATS | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=pchtherm&manpath=FreeBSD+13.0-RELEASE+and+Ports>

home | help