Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 08-05-2008 Installation Manual page 527

and the hardware (or the BIOS) overwrite this setting when the system gets too
warm.
/proc/acpi/processor/*
A separate subdirectory is kept for each CPU included in your system.
/proc/acpi/processor/*/info
Information about the energy saving options of the processor.
/proc/acpi/processor/*/power
Information about the current processor state. An asterisk next to C2 indicates that
the processor is idle. This is the most frequent state, as can be seen from the usage
value.
/proc/acpi/processor/*/throttling
Can be used to set the throttling of the processor clock. Usually, throttling is possible
in eight levels. This is independent of the frequency control of the CPU.
/proc/acpi/processor/*/limit
If the performance (outdated) and the throttling are automatically controlled by a
daemon, the maximum limits can be specified here. Some of the limits are deter-
mined by the system. Some can be adjusted by the user.
/proc/acpi/thermal_zone/
A separate subdirectory exists for every thermal zone. A thermal zone is an area
with similar thermal properties whose number and names are designated by the
hardware manufacturer. However, many of the possibilities offered by ACPI are
rarely implemented. Instead, the temperature control is handled conventionally by
the BIOS. The operating system is not given much opportunity to intervene, because
the life span of the hardware is at stake. Therefore, some of the files only have a
theoretical value.
/proc/acpi/thermal_zone/*/temperature
Current temperature of the thermal zone.
/proc/acpi/thermal_zone/*/state
The state indicates if everything is ok or if ACPI applies active or passive
cooling. In the case of ACPI-independent fan control, this state is always ok.
Power Management 509