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Diffstat (limited to 'Documentation/thinkpad-acpi.txt')
-rw-r--r-- | Documentation/thinkpad-acpi.txt | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt index 5d827ded34d1..3eb949e14a02 100644 --- a/Documentation/thinkpad-acpi.txt +++ b/Documentation/thinkpad-acpi.txt | |||
@@ -710,23 +710,15 @@ Temperature sensors | |||
710 | procfs: /proc/acpi/ibm/thermal | 710 | procfs: /proc/acpi/ibm/thermal |
711 | sysfs device attributes: (hwmon) temp*_input | 711 | sysfs device attributes: (hwmon) temp*_input |
712 | 712 | ||
713 | Most ThinkPads include six or more separate temperature sensors but | 713 | Most ThinkPads include six or more separate temperature sensors but only |
714 | only expose the CPU temperature through the standard ACPI methods. | 714 | expose the CPU temperature through the standard ACPI methods. This |
715 | This feature shows readings from up to eight different sensors on older | 715 | feature shows readings from up to eight different sensors on older |
716 | ThinkPads, and it has experimental support for up to sixteen different | 716 | ThinkPads, and up to sixteen different sensors on newer ThinkPads. |
717 | sensors on newer ThinkPads. | ||
718 | |||
719 | EXPERIMENTAL: The 16-sensors feature is marked EXPERIMENTAL because the | ||
720 | implementation directly accesses hardware registers and may not work as | ||
721 | expected. USE WITH CAUTION! To use this feature, you need to supply the | ||
722 | experimental=1 parameter when loading the module. When EXPERIMENTAL | ||
723 | mode is enabled, reading the first 8 sensors on newer ThinkPads will | ||
724 | also use an new experimental thermal sensor access mode. | ||
725 | 717 | ||
726 | For example, on the X40, a typical output may be: | 718 | For example, on the X40, a typical output may be: |
727 | temperatures: 42 42 45 41 36 -128 33 -128 | 719 | temperatures: 42 42 45 41 36 -128 33 -128 |
728 | 720 | ||
729 | EXPERIMENTAL: On the T43/p, a typical output may be: | 721 | On the T43/p, a typical output may be: |
730 | temperatures: 48 48 36 52 38 -128 31 -128 48 52 48 -128 -128 -128 -128 -128 | 722 | temperatures: 48 48 36 52 38 -128 31 -128 48 52 48 -128 -128 -128 -128 -128 |
731 | 723 | ||
732 | The mapping of thermal sensors to physical locations varies depending on | 724 | The mapping of thermal sensors to physical locations varies depending on |