Man Pages

thermald


NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO

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 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.

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.

SEE ALSO

thermal-conf.xml(5)

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