NAME

       amdtemp — device driver for AMD processor on-die digital thermal sensor

SYNOPSIS

       To compile this driver into the kernel, place the following line in your kernel configuration file:

             device amdtemp

       Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

             amdtemp_load="YES"

DESCRIPTION

       The amdtemp driver provides support for the on-die digital thermal sensor present in AMD Family 0Fh, 10h,
       11h, 12h, 14h, 15h, 16h, and 17h processors.

       For Family 0Fh processors, the amdtemp driver reports each core's temperature through sysctl nodes, named
       dev.amdtemp.%d.core{0,1}.sensor{0,1}.    The   driver   also   creates   dev.cpu.%d.temperature   in  the
       corresponding CPU device's sysctl tree, displaying the maximum temperature of the two sensors located  in
       each CPU core.

       For  Family  10h,  11h,  12h,  14h,  15h,  16h,  and  17h  processors,  the driver reports each package's
       temperature  through  a  sysctl  node,  named  dev.amdtemp.%d.core0.sensor0.   The  driver  also  creates
       dev.cpu.%d.temperature  in  the corresponding CPU device's sysctl tree, displaying the temperature of the
       shared sensor located in each CPU package.

SYSCTL VARIABLES

       The following variable is available as both sysctl(8) variable and loader(8) tunable:

       dev.amdtemp.%d.sensor_offset
       Add the given offset to the temperature of the sensor.  Default is 0.

SEE ALSO

       loader(8), sysctl(8)

HISTORY

       The amdtemp driver first appeared in FreeBSD 7.1.

AUTHORS

       Rui Paulo <rpaulo@FreeBSD.org>
       Norikatsu Shigemura <nork@FreeBSD.org>
       Jung-uk Kim <jkim@FreeBSD.org>

CAVEATS

       For Family 10h and later processors, “(the reported temperature) is a non-physical  temperature  measured
       on  an  arbitrary  scale  and  it  does  not  represent  an  actual physical temperature like die or case
       temperature.  Instead, it specifies the processor temperature relative to the point at which  the  system
       must  supply  the  maximum  cooling  for  the  processor's specified maximum case temperature and maximum
       thermal power dissipation” according to BIOS and Kernel Developer's  Guide  (BKDG)  for  AMD  Processors,
       http://developer.amd.com/resources/developer-guides-manuals/.

Debian                                          September 5, 2017                                     AMDTEMP(4)