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, and 15h 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, and 15h 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/documentation/guides/Pages/default.aspx.

Debian                                          February 23, 2012                                     AMDTEMP(4)