diff options
| author | Len Brown <len.brown@intel.com> | 2007-08-12 00:12:35 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-08-12 00:12:35 -0400 |
| commit | a70cdc5200b0eb9fc3ef64efb29baac9b2cf2431 (patch) | |
| tree | 1ae0722744cea5740ecf3141b7b3a4da2411bb19 /Documentation/kernel-parameters.txt | |
| parent | 730ff34de766a6fddee25ac1c32bc49c1a2fd758 (diff) | |
ACPI: thermal: create "thermal.psv=" to override passive trip points
"thermal.psv=-1" disables passive trip points
for all ACPI thermal zones.
"thermal.psv=C", where 'C' is degrees Celsius,
overrides all existing passive trip points
for all ACPI thermal zones.
thermal.psv is checked at module load time,
and in response to trip-point change events.
Note that if the system does not deliver thermal zone
temperature change events near the new trip-point,
then it will not be noticed. To force your custom
trip point to be noticed, you may need to enable polling:
eg. thermal.tzp=3000 invokes polling every 5 minutes.
Note that once passive thermal throttling is invoked,
it has its own internal Thermal Sampling Period (_TSP),
that is unrelated to _TZP.
WARNING: disabling or raising a thermal trip point
may result in increased running temperature and
shorter hardware lifetime on some systems.
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index ed7d7913af8..52e1c2d26a2 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1823,6 +1823,10 @@ and is between 256 and 4096 characters. It is defined in the file thermal.off= [HW,ACPI] 1: disable ACPI thermal control + thermal.psv= [HW,ACPI] + -1: disable all passive trip points + <degrees C>: override all passive trip points to this value + thermal.tzp= [HW,ACPI] Specify global default ACPI thermal zone polling rate <deci-seconds>: poll all this frequency |