Provided by: thermald_1.7.0-5ubuntu5_amd64 bug

NAME

       thermal-conf.xml - Configuration file for thermal daemon

SYNOPSIS

       $(TDCONFDIR)/etc/thermald/thermal-conf.xml

DESCRIPTION

       thermal-conf.xml is a configuration file for the thermal daemon. It is used to configure thermal sensors,
       zone  and cooling devices.The location of this file depends on the configuration option used during build
       time.

       The terminology used in this file conforms to "Advanced Configuration and Power Interface Specification".
       The ACPI thermal model is based around conceptual platform regions called thermal zones that physically
       contain devices, thermal sensors, and cooling controls. For example of a thermal zone can be a CPU or a
       laptop cover. A zone can contain multiple sensors for monitoring temperature. A cooling device provides
       interface to reduce the temperature of a source device, which causes increase in the temperature. An
       example of a cooling device is a FAN or some Linux driver which can throttle the source device.

       A thermal zone configuration includes one or more trip points. A trip point is a temperature at which a
       cooling device needs to be activated.

       A cooling device can be either active or passive. An example of an active device is a FAN, which will not
       reduce performance at the cost of consuming more power and noise. A passive device uses performance
       throttling to control temperature. In addition to cooling devices present in the thermal sysfs, the
       following cooling devices are built into the thermald, which can be used as valid cooling device type:

            - rapl_controller

            - intel_pstate

            - cpufreq

            - LCD

       The thermal sysfs under Linux (/sys/class/thermal) provides a way to represent per platform ACPI
       configuration. The kernel thermal governor uses this data to keep the platform thermals under control.
       But there are some limitations, which thermald tries to resolve. For example:

       - If the ACPI data is not optimized or buggy. In this case thermal-conf.xml can be used to correct the
       behavior without change in BIOS.

       - There may be thermal zones exposed by the thermal sysfs without associated cooling actions. In this
       case thermal conf.xml can be used to tie the cooling devices to those zones.

       - The best cooling method may not be in the thermal sysfs. In this case thermal-conf.xml can be used to
       bind a zone to an external cooling device.

       - Specify thermal relationships. A zone can be influenced by multiple source devices with varying
       degrees. In this case thermal-conf.xml can be used to define the relative influence for apply
       compensation.

FILE FORMAT

       The configuration file format conforms to XML specifications. A set of tags defined to  define  platform,
       sensors, zones, cooling devices and trip points.

       <ThermalConfiguration>

       <Platform>

            <Name>Example Platform Name</Name>

            <!--UUID is optional, if present this will be matched. Both product name and UUID can contain wild
       card "*", which matches any platform.-->

            <UUID>Example UUID</UUID>

            configuration file format conforms to XML specifications. A set of tags defined to define platform,
       sensors, zones,  cooling
                     devices and trip points.

                     <ThermalConfiguration>

                     <Platform>

                   <ProductName>Example Product Name</ProductName>

            <Preference>QUIET|PERFORMANCE</Preference>

            <!-Quiet mode will only use passive cooling device. "PERFORMANCE" will only select active devices
       .-->

            <ThermalSensors>

                 <ThermalSensor>

                      <!-- New Sensor with a type and path -->

                      <Type>example_sensor_1</Type>

                      <Path>/some_path</Path>

                      <AsyncCapable>0</AsyncCapable>

                 </ThermalSensor>

                 <ThermalSensor>

                      <!-- Already present in thermal sysfs, enable this or add/change config For example, here
       we are indicating that sensor can do async events to avoid polling
                             -->

                      <Type>example_thermal_sysfs_sensor</Type>

                      <!-- If async capable, then we don't need to poll -->

                      <AsyncCapable>1</AsyncCapable>

                 </ThermalSensor>

            </ThermalSensors>

            <ThermalZones>

                 <ThermalZone>

                      <Type>Example Zone type</Type>

                      <TripPoints>

                           <TripPoint>

                                <SensorType>example_sensor_1</SensorType>

                                <!-- Temperature at which to take action -->

                                <Temperature> 75000 </Temperature>

                                <!-- max/passive/active If a MAX type is specified, then daemon will use PID
       control to aggressively throttle to avoid reaching this temp.-->

                                <type>max</type>

                                <!-- SEQUENTIAL | PARALLEL. When a trip point temp is violated, then number of
       cooling devices can be activated. If control type is SEQUENTIAL then, it will exhaust first cooling
       device before trying next. -->

                                <ControlType>SEQUENTIAL</ControlType>

                                <CoolingDevice>

                                     <index>1</index>

                                     <type>example_cooling_device</type>

                                     <!-- Influence will be used order cooling devices. First cooling device
       will be used, which has highest influence. -->

                                     <influence> 100 </influence>

                                     <!-- Delay in using this cdev, this takes some time too actually cool a
       zone -->

                                     <SamplingPeriod> 12 </SamplingPeriod>

                                     <!-- Set a specific state of this cooling device when this trip is violated
       -->

                                     <TargetState> 6 </TargetState>

                                     </CoolingDevice>

                           </TripPoint>

                      </TripPoints>

                 </ThermalZone>

            </ThermalZones>

            <CoolingDevices>

                 <CoolingDevice>

                      <!-- Cooling device can be specified by a type and optionally a sysfs path. If the type is
       already present in thermal sysfs, there is no need of a path. Compensation can use min/max and step size
       to increasing cool the system. Debounce period can be used to force a waiting period for action. -->

                      <Type>example_cooling_device</Type>

                      <MinState>0</MinState>

                      <IncDecStep>10</IncDecStep>

                      <ReadBack> 0 </ReadBack>

                      <MaxState>50</MaxState>

                      <DebouncePeriod>5000</DebouncePeriod>

                      <!-- If there are no PID parameters, compensation increase step wise and exponentially (if
       single step is not able to change trend). Alternatively a PID parameters can be specified then next step
       will use PID calculation using provided PID constants. -->

                      <PidControl>

                           <kp>0.001</kp>

                           <kd>0.0001</kd>

                           <ki>0.0001</ki>

                      </PidControl>

                      <!-- Write some prefix attached to state value, like below the prefix is "level ". It will
       preserve spaces as entered when writing to sysfs -->
                             <WritePrefix>level </WritePrefix>           </CoolingDevice>

            </CoolingDevices>

       </Platform>

       </ThermalConfiguration>

EXAMPLE CONFIGURATIONS

       Example 1: This is a very simple configuration, to change the passive limit on the CPU. Instead of
       default, this new temperature 86C in the configuration is used. This will start cooling, once the
       temperature reaches 86C.

       <?xml version="1.0"?>

       <ThermalConfiguration>

               <Platform>

                       <Name>Overide CPU default passive</Name>

                       <ProductName>*</ProductName>

                       <Preference>QUIET</Preference>

                       <ThermalZones>

                               <ThermalZone>

                                       <Type>cpu</Type>

                                       <TripPoints>

                                                       <TripPoint>

                                                               <Temperature>86000</Temperature>

                                                               <type>passive</type>

                                                       </TripPoint>

                                       </TripPoints>

                               </ThermalZone>

                       </ThermalZones>

               </Platform>

       </ThermalConfiguration>

       Example 2: In this configuration, we are controlling backlight when some sensor "SEN2" reaches 60C. Here
       "LCD" is a standard cooling device, which uses Linux backlight sysfs interface. "LCD_Zone" is a valid
       thermal zone in Linux thermal sysfs on the test platform, hence we don't need to provide path for sysfs
       for "LCD_Zone". The Linux thermal sysfs is already parsed and loaded by thermald program.

       <?xml version="1.0"?>

       <ThermalConfiguration>

            <Platform>

                 <Name>Change Backlight</Name>

                 <ProductName>*</ProductName>

                 <Preference>QUIET</Preference>

                 <ThermalZones>

                      <ThermalZone>

                           <Type>LCD_Zone</Type>

                           <TripPoints>

                                     <TripPoint>

                                          <SensorType>SEN2</SensorType>

                                          <Temperature>60000</Temperature>

                                          <type>passive</type>

                                     <CoolingDevice>

                                          <Type>LCD</Type>

                                     </CoolingDevice>

                                     </TripPoint>

                           </TripPoints>

                      </ThermalZone>

                 </ThermalZones>

            </Platform>

       </ThermalConfiguration>

       Example 3: In this example Lenovo Thinkpad X220 and fan speed is controlled. Here a cooling device
       "_Fan", can be controlled via sysfs
              /sys/devices/platform/thinkpad_hwmon/pwm1.  When the x86_pkg_temp reaches 45C, Fan is started with
              increasing speeds, if the temperature can't be controlled at 45C.

       <?xml version="1.0"?>

       <ThermalConfiguration>

       <Platform>

       <Name>Lenovo ThinkPad X220</Name>

       <ProductName>*</ProductName>

       <Preference>QUIET</Preference>

       <ThermalZones>

                       <ThermalZone>

                                       <Type>x86_pkg_temp</Type>

                                       <TripPoints>

                                                       <TripPoint>

                                                                       <SensorType>x86_pkg_temp</SensorType>

                                                                       <Temperature>45000</Temperature>

                                                                       <type>passive</type>

                                                                       <ControlType>SEQUENTIAL</ControlType>

                                                                       <CoolingDevice>

                                                                                       <index>1</index>

                                                                                       <type>_Fan</type>

                                                                                       <influence> 100
       </influence>

                                                                                       <SamplingPeriod> 12
       </SamplingPeriod>

                                                                       </CoolingDevice>

                                                       </TripPoint>

                                       </TripPoints>

                       </ThermalZone>

       </ThermalZones>

       <CoolingDevices>

                       <CoolingDevice>

                                       <Type>_Fan</Type>

                                       <Path>/sys/devices/platform/thinkpad_hwmon/pwm1</Path>

                                       <MinState>0</MinState>

                                       <IncDecStep>30</IncDecStep>

                                       <ReadBack> 0 </ReadBack>

                                       <MaxState>255</MaxState>

                                       <DebouncePeriod>5</DebouncePeriod>

                       </CoolingDevice>

       </CoolingDevices>

       </Platform>

       </ThermalConfiguration>

       Example 4: The following example shows how PID can be used. Here once temperature exceeds 80C,
       compensation is calculated using PID using 80C as set point of PID. The compensation depends on error
       from the set point. Here the default built in processor cooling device is used with min state as 0 and
       max state as 10.

       <?xml version="1.0"?>

       <ThermalConfiguration>

       <Platform>

       <Name>Use PID param </Name>

       <ProductName>*</ProductName>

       <Preference>QUIET</Preference>

       <ThermalZones>

                       <ThermalZone>

                                       <Type>x86_pkg_temp</Type>

                                       <TripPoints>

                                                       <TripPoint>

                                                                       <SensorType>x86_pkg_temp</SensorType>

                                                                       <Temperature>80000</Temperature>

                                                                       <type>passive</type>

                                                                       <ControlType>SEQUENTIAL</ControlType>

                                                                       <CoolingDevice>

                                                    <type>Processor</type>

                                                                       </CoolingDevice>

                                                       </TripPoint>

                                       </TripPoints>

                       </ThermalZone>

       </ThermalZones>

        <CoolingDevices>

                      <CoolingDevice>

                                       <Type>Processor</Type>

                                       <PidControl>

                                                     <kp>0.0002</kp>

                                                     <kd>0</kd>

                                                     <ki>0</ki>

                                       </PidControl>

                     </CoolingDevice>

       </CoolingDevices>

       </Platform>

       </ThermalConfiguration>

       Example 5: The following example shows how to control Fan when the sysfs expects some string prefix. For
       example instead of just write a number to fan control sysfs, the interface requires "level " in front of
       the speed index value.

       <?xml version="1.0"?>

       <ThermalConfiguration>

            <Platform>

                 <Name>Use Fan control first then CPU throttle </Name>

                 <ProductName>*</ProductName>

                 <Preference>QUIET</Preference>

                 <ThermalZones>

                              <ThermalZone>

                                              <Type>x86_pkg_temp</Type>

                                              <TripPoints>

                                                              <TripPoint>

                                                                              <SensorType>x86_pkg_temp</SensorType>

                                                                              <Temperature>80000</Temperature>

                                                    <type>passive</type>

                                                                              <ControlType>SEQUENTIAL</ControlType>

                                                                              <CoolingDevice>

                                                           <type>_fan_</type>

                                                                              </CoolingDevice>

                                                              </TripPoint>

                                              </TripPoints>

                              </ThermalZone>

                       </ThermalZones>

                       <CoolingDevices>

                             <CoolingDevice>

                                              <Type>_fan_</Type>

                                <Path>/proc/acpi/ibm/fan</Path>

                                <WritePrefix>level </WritePrefix>

                                <MinState>0</MinState>

                                <MaxState>5</MaxState>

                                <DebouncePeriod>10</DebouncePeriod>

                            </CoolingDevice>

                       </CoolingDevices>

              </Platform>

       </ThermalConfiguration>

       Example 6: Similar to example 5, but write different speeds at different temperatures.

       <?xml version="1.0"?>

       <ThermalConfiguration>

            <Platform>

                 <Name>Use Fan control first then CPU throttle </Name>

                 <ProductName>*</ProductName>

                 <Preference>QUIET</Preference>

                 <ThermalZones>

                              <ThermalZone>

                                              <Type>x86_pkg_temp</Type>

                                              <TripPoints>

                                                              <TripPoint>

                                                                              <SensorType>x86_pkg_temp</SensorType>

                                                                              <Temperature>80000</Temperature>

                                                    <type>passive</type>

                                                                              <CoolingDevice>

                                                           <type>_fan_</type>

                                                                              <TargetState>1</TargetState>

                                                                              </CoolingDevice>

                                                              </TripPoint>

                                                              <TripPoint>

                                                                              <SensorType>x86_pkg_temp</SensorType>

                                                                              <Temperature>85000</Temperature>

                                                    <type>passive</type>

                                                                              <CoolingDevice>

                                                           <type>_fan_</type>

                                                                              <TargetState>2</TargetState>

                                                                              </CoolingDevice>

                                                              </TripPoint>

                                              </TripPoints>

                              </ThermalZone>

                       </ThermalZones>

                       <CoolingDevices>

                             <CoolingDevice>

                                              <Type>_fan_</Type>

                                <Path>/proc/acpi/ibm/fan</Path>

                                <WritePrefix>level </WritePrefix>

                                <MinState>0</MinState>

                                <MaxState>5</MaxState>

                                <DebouncePeriod>10</DebouncePeriod>

                            </CoolingDevice>

                      </CoolingDevices>

              </Platform>

       </ThermalConfiguration>