Ubuntu Feisty 7.04 manual page repository
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acpi_thermal - ACPI thermal management subsystem
The acpi_thermal driver provides the thermal management features of the devd(8) notifi‐ cation 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 accord‐ ing to each thermal zone’s setpoints. 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.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. hw.acpi.thermal.tz%d._HOT Temperature to start critical suspend to disk (S4). hw.acpi.thermal.tz%d._CRT Temperature to start critical shutdown (S5). hw.acpi.thermal.tz%d._ACx Temperatures at which to switch to the corresponding active cool‐ ing level. For instance, values of "3200 3100" mean to switch on _AC0 at 320.0K and _AC1 at 310.0K. The lower the _ACx value, the higher the cooling power. All temperatures are represented in tenths of a Kelvin. For example, 300.0K is represented by the integer 3000. To convert to units of Centi‐ grade, the formula is (x - 2731.5) / 10. 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. acpidump(8)
Michael Smith This manual page was written by Takanori Watanabe.