amdtemp(4) [freebsd man page]
AMDTEMP(4) BSD Kernel Interfaces Manual AMDTEMP(4) 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, display- ing 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. BSD
February 23, 2012 BSD
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ACPI_THERMAL(4) BSD Kernel Interfaces Manual ACPI_THERMAL(4) NAME
acpi_thermal -- ACPI thermal management subsystem SYNOPSIS
device acpi DESCRIPTION
The acpi_thermal driver provides the thermal management features of the ACPI module. This driver has a sysctl(8) interface and a devd(8) notification interface. The sysctls export properties of each ACPI thermal zone object. There can be multiple thermal zones in a system. For example, each CPU and the enclosure could all be separate thermal zones, each with its own setpoints and cooling devices. Thermal zones are numbered sequentially in the order they appear in the AML. The acpi_thermal driver also activates the active cooling system according to each thermal zone's setpoints. SYSCTL VARIABLES
hw.acpi.thermal.min_runtime Number of seconds to continue active cooling once started. A new active cooling level will not be selected until this interval expires. hw.acpi.thermal.polling_rate Number of seconds between polling the current temperature. hw.acpi.thermal.user_override If set to 1, allow user override of various setpoints (below). The original values for these settings are obtained from the BIOS and system overheating and possible damage could occur if changed. Default is 0 (no override). hw.acpi.thermal.tz%d.active Current active cooling system state. If this is non-negative, the appropriate _AC%d object is running. Set this value to the desired active cooling level to force the corresponding fan object to the appropriate level. hw.acpi.thermal.tz%d.passive_cooling If set to 1, passive cooling is enabled. It does cooling without fans using cpufreq(4) as the mechanism for controlling CPU speed. Default is enabled for tz0 where it is available. hw.acpi.thermal.tz%d.thermal_flags Current thermal zone status. These are bit-masked values. hw.acpi.thermal.tz%d.temperature Current temperature for this zone. hw.acpi.thermal.tz%d._PSV Temperature to start passive cooling by throttling down CPU, etc. This value can be overridden by the user. hw.acpi.thermal.tz%d._HOT Temperature to start critical suspend to disk (S4). This value can be overridden by the user. hw.acpi.thermal.tz%d._CRT Temperature to start critical shutdown (S5). This value can be overridden by the user. hw.acpi.thermal.tz%d._ACx Temperatures at which to switch to the corresponding active cooling level. The lower the _ACx value, the higher the cooling power. All temperatures are printed in Celsius. Values can be set in Celsius (by providing a trailing "C") or Kelvin (by leaving off any trailing letter). When setting a value by sysctl(8), do not specify a trailing decimal (i.e., 90C instead of 90.0C). NOTIFIES
Notifies are passed to userland via devd(8). See /etc/devd.conf and devd.conf(5) for examples. The acpi_thermal driver sends events with the following attributes: system ACPI subsystem Thermal type The fully qualified thermal zone object path as in the ASL. notify An integer designating the event: 0x80 Current temperature has changed. 0x81 One or more trip points (_ACx, _PSV) have changed. 0x82 One or more device lists (_ALx, _PSL, _TZD) have changed. 0xcc Non-standard notify that the system will shutdown if the temperature stays above _CRT or _HOT for one more poll cycle. SEE ALSO
acpi(4), cpufreq(4), acpidump(8) AUTHORS
Michael Smith This manual page was written by Takanori Watanabe. BSD
March 17, 2007 BSD