thermald(8)                 System Manager's Manual                thermald(8)

       thermald - start Linux thermal daemon

       thermald  [ OPTIONS ]

       thermald is a Linux daemon used to prevent the overheating of
       platforms. This daemon monitors temperature and applies compensation
       using available cooling methods.

       By default, it monitors CPU temperature using available CPU digital
       temperature sensors and maintains CPU temperature under control, before
       HW takes aggressive correction action.

       Thermal daemon looks for thermal sensors and thermal cooling drivers in
       the Linux thermal sysfs (/sys/class/thermal) and builds a list of
       sensors and cooling drivers. Each of the thermal sensors can optionally
       be binded to a cooling drivers by the in kernel drivers. In this case
       the Linux kernel thermal core can directly take actions based on the
       temperature trip points, for each sensor and associated cooling device.
       For example a trip temperature X in a sensor can be associates a
       cooling driver Y. So when the sensor temperature = X, the cooling
       driver "Y" is activated.

       Thermal daemon allows one to change this relationship or add new one
       via a thermal configuration file (thermal-conf.xml). This file is
       automatically created ( and used, if the platform
       has ACPI thermal relationship table.  If not this needs to be manually

       For manual configuration refer to the manual page of the thermal-

       In some newer platforms the auto creation of the config file is done by
       a companion tool "dptfxtract". This tool can be downloaded from
       "". It is suggested as parts of the
       install process, run dptfxtract.

       There can be multiple configuration files. User can select a
       configuration file via -config-file option to overide the default
       selection. The default selection picks one of the file in the following

       - /etc/thermald/

       - /var/run/thermald/

       - /etc/thermald/thermal-conf.xml

       (*Assuming configure prefix=/ is used during build.)

       There is another companion tool "ThermalMonitor", which presents a
       graphical front end. This allows the monitoring of sensors and changing
       of thermal trips to give the user more control. The source code of
       "ThermalMonitor" is a part of the thermald github source, in the tools

       -h, --help
              Show help options.

              Print thermald version and exit.

              Don't become a daemon: Default is daemon mode.

              log severity: info level and up.

              log severity: debug level and up: Max logging.

              Poll interval in seconds: Poll for zone temperature changes.  To
              disable polling, set to zero. Polling can only be disabled, if
              available temperature sensors can notify temperature change

              Enable Dbus.

              Act as exclusive thermal controller. This will use user-space
              governor for thermal sysfs and take over control.

              Ignore cpuid check for supported CPU models.

              Specify thermal-conf.xml path and ignore default thermal-

              Ignore default CPU temperature control. Strictly follow thermal-
              conf.xml or  --workaround-enabled Enable
              special workarounds. This is currently used for /dev/mem based
              power control.  --disable-active-power Disable active power
              management. This will not set active power limits.


                                  8 May 2013                       thermald(8)