NAME

       thermald - start Linux thermal daemon

SYNOPSIS

       thermald  [ OPTIONS ]

DESCRIPTION

       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 configured.

       When  there  is  a  sensor,  which  has  no  associate  cooling device, via configuration file or thermal
       relationship table, then this sensor is tested for relationship with CPU load dynamically up to maximum 3
       times. If there is no relationship, then it is added to a black list of unbinded sensors  and  not  tried
       again.

       Optionally thermal daemon can act as an exclusive thermal controller by using thermal sysfs and acting as
       a  user  space governor.  In this case kernel thermal core is not active and decision is taken by thermal
       daemon only.

       Dbus Interface: When started with dbus-enable option, dbus interface  can  be  used  to  control  thermal
       temperature  at  which  cooling  action takes place. This change is persistent. For example, to start CPU
       cooling at 80C, dbus-send command can be used:

       #       dbus-send        --system        --dest=org.freedesktop.thermald        /org/freedesktop/thermald
       org.freedesktop.thermald.SetUserPassiveTemperature string:cpu uint32:80000

OPTIONS

       -h, --help
              Show help options.

       --version
              Print thermald version and exit.

       --no-daemon
              Don't become a daemon: Default is daemon mode.

       --loglevel=info
              log severity: info level and up.

       --loglevel=debug
              log severity: debug level and up: Max logging.

       --poll-interval
              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
              asynchronously.

       --dbus-enable
              Enable Dbus.

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

       --ignore-cpuid-check
              Ignore cpuid check for supported CPU models.

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

SEE ALSO

       thermal-conf.xml(5)

                                                   8 May 2013                                        thermald(8)