A fork of smc-command from https://github.com/hholtmann/smcFanControl/.
Warning
-------
This tool will allow you to write values to the SMC which could
irreversably damage your computer. Manipulating the fans could
cause overheating and permanent damage. USE THIS PROGRAM AT YOUR
OWN RISK!
Background
----------
I created this program because I was unhappy with my MacBook Pro
running so hot and it annoyed me that Apple didn't make any way
for end users to set fan preferences.
This program will allow you to read and write values to the SMC
using the AppleSMC kernel extension. The purpose of this is to
show how to talk to the controller. I've made no effort to make
it user friendly, however I'm releasing this in hopes that someone
will take the next logical step and make a nice *free* GUI. I
think it's absurd that some people are trying to charge for simple
programs to manipulate this type of data.
In my testing I've been able to lower the average system
temperature by 15C just by running the fans at a low speed like
3500 RPM, which you can barely hear.
Usage
------
# smc -h
Apple System Management Control (SMC) tool 0.01
Usage:
./smc [options]
-f : fan info decoded
-h : help
-k <key> : key to manipulate
-l : list all keys and values
-r : read the value of a key
-w <value> : write the specified value to a key
-v : version
Fan control
-----------
To decode:
# smc -f
To manually query and control:
FNum - tells you how many fans are in the system
To read data from each fan:
F0Ac - Fan actual speed
F0Mn - Fan minimum speed
F0Mx - Fan maximum speed
F0Sf - Fan safe speed
F0Tg - Fan target speed
FS! - See if fans are in automatic or forced mode
[Replace 0 with fan #. In the MacBook Pro there two fans so this
applies for 0 (left) and 1 (right).]
To set a fan to a specific speed:
FS! - Sets "force mode" to fan. Bit 0 (right to left) is fan 0,
bit 1 is fan 1, etc
F0Tg - Sets target speed, make sure you fp78 encode it (left shift
by 2)
For example, to force both fans to 3500 RPM:
# python -c "print hex(3500 << 2)"
0x36b0
# smc -k "FS! " -w 0003
# smc -k F0Tg -w 36b0
# smc -k F1Tg -w 36b0
..to force fan 0 to 4000 RPM and leave fan 1 in automatic mode:
# smc -k "FS! " -w 0001
# smc -k F0Tg -w 3e80
..to return both fans to automatic mode:
# smc -k "FS! " -w 0000
Temperature sensors
-------------------
TB0T
TC0D
TC0P
TM0P
TN0P
Th0H
Ts0P
TN1P
Th1H
Light sensors
-------------
ALV0 - Left
ALV1 - Right
Motion sensors
--------------
MO_X
MO_Y
MO_Z