Hello.
I have a Lenovo Thinkpad R61 laptop and I'm trying to set up correctly
fancontrol on it.
First of all, I loaded the thinkpad-acpi kernel module with the
fan_control=1 option, otherwise the following steps don't work.
Then I ran pwmconfig in order to generate the /etc/fancontrol file.
Finally, I started fancontrol via "rc.d start fancontrol" (I'm running
an Arch Linux system).
When idle, I get:
- fan1: 2604 RPM
- temp1: +40.0C
When busy, I get:
- fan1: 3176 RPM
- temp1: +65.0C
If now I stop fancontrol with "rc.d stop fancontrol" and wait some
minutes, I get (system is stil busy):
- fan1: 4993 RPM
- temp1: +58.0C
That is, fan speed skyrocketed without any reason.
At http://www.kernel.org/doc/Documentation/laptops/thinkpad-acpi.txt I
learned this is called "disengaged" mode, and it's not a safe mode to
use. Let me quote:
> There is also a "full-speed" level, also known as "disengaged" level.
In this level, the EC disables the speed-locked closed-loop fan control,
and drives the fan as fast as it can go, which might exceed hardware
limits, so use this level with caution.
I also noticed that while fancontrol is running, file
/sys/class/hwmon/hwmon2/device/pwm1_enable is set to 1 (PWM manual),
while when it quits that file is set to 0 (PWM disabled) instead of 2
(PWM automatic). Why?
Beside this, I also tried manually setting PWM values in
/sys/class/hwmon/hwmon2/device/pwm1, and I found that with values
between 32 and 255 the fan runs, while with values between 0 and 31 the
fan stops completely. My question is: MINSTART/MINSTOP should be both 32
in my case?
Last thing. It seems the only values you can save into
/sys/class/hwmon/hwmon2/device/pwm1 are: 255, 218, 182, 145, 109, 72, 36
and 0. Other values get mapped to those previous values. Is this normal?
Thank you and sorry for the long message.
# pwmconfig revision 5857 (2010-08-22)
This program will search your sensors for pulse width modulation (pwm)
controls, and test each one to see if it controls a fan on
your motherboard. Note that many motherboards do not have pwm
circuitry installed, even if your sensor chip supports pwm.
We will attempt to briefly stop each fan using the pwm controls.
The program will attempt to restore each fan to full speed
after testing. However, it is ** very important ** that you
physically verify that the fans have been to full speed
after the program has completed.
Found the following devices:
hwmon0 is acpitz
hwmon1/device is coretemp
hwmon2/device is thinkpad
Found the following PWM controls:
hwmon2/device/pwm1
hwmon2/device/pwm1 is currently setup for automatic speed control.
In general, automatic mode is preferred over manual mode, as
it is more efficient and it reacts faster. Are you sure that
you want to setup this output for manual control? (n)
There are no usable PWM outputs.
[root@laptop ~]# pwmconfig
# pwmconfig revision 5857 (2010-08-22)
This program will search your sensors for pulse width modulation (pwm)
controls, and test each one to see if it controls a fan on
your motherboard. Note that many motherboards do not have pwm
circuitry installed, even if your sensor chip supports pwm.
We will attempt to briefly stop each fan using the pwm controls.
The program will attempt to restore each fan to full speed
after testing. However, it is ** very important ** that you
physically verify that the fans have been to full speed
after the program has completed.
Found the following devices:
hwmon0 is acpitz
hwmon1/device is coretemp
hwmon2/device is thinkpad
Found the following PWM controls:
hwmon2/device/pwm1
hwmon2/device/pwm1 is currently setup for automatic speed control.
In general, automatic mode is preferred over manual mode, as
it is more efficient and it reacts faster. Are you sure that
you want to setup this output for manual control? (n) y
Giving the fans some time to reach full speed...
Found the following fan sensors:
hwmon2/device/fan1_input current speed: 2733 RPM
Warning!!! This program will stop your fans, one at a time,
for approximately 5 seconds each!!!
This may cause your processor temperature to rise!!!
If you do not want to do this hit control-C now!!!
Hit return to continue:
Testing pwm control hwmon2/device/pwm1 ...
hwmon2/device/fan1_input ... speed was 2733 now 0
It appears that fan hwmon2/device/fan1_input
is controlled by pwm hwmon2/device/pwm1
Would you like to generate a detailed correlation (y)? y
Note: If you had gnuplot installed, I could generate a graphical plot.
PWM 255 FAN 2554
PWM 240 FAN 2896
PWM 225 FAN 3041
PWM 210 FAN 3041
PWM 195 FAN 3070
PWM 180 FAN 3070
PWM 165 FAN 2766
PWM 150 FAN 2766
PWM 135 FAN 2766
PWM 120 FAN 2766
PWM 105 FAN 2766
PWM 90 FAN 2766
PWM 75 FAN 2415
PWM 60 FAN 2415
PWM 45 FAN 2415
PWM 30 FAN 0
Fan Stopped at PWM = 30
Testing is complete.
Please verify that all fans have returned to their normal speed.
The fancontrol script can automatically respond to temperature changes
of your system by changing fanspeeds.
Do you want to set up its configuration file now (y)? y
What should be the path to your fancontrol config file (/etc/fancontrol)?
Loading configuration from /etc/fancontrol ...
Select fan output to configure, or other action:
1) hwmon2/device/pwm1 3) Just quit 5) Show configuration
2) Change INTERVAL 4) Save and quit
select (1-n): 4
Saving configuration to /etc/fancontrol...
Configuration saved
# Configuration file generated by pwmconfig, changes will be lost
INTERVAL=10
DEVPATH=hwmon2=devices/platform/thinkpad_hwmon
DEVNAME=hwmon2=thinkpad
FCTEMPS=hwmon2/device/pwm1=hwmon2/device/temp1_input
FCFANS=hwmon2/device/pwm1=hwmon2/device/fan1_input
MINTEMP=hwmon2/device/pwm1=30
MAXTEMP=hwmon2/device/pwm1=60
MINSTART=hwmon2/device/pwm1=32
MINSTOP=hwmon2/device/pwm1=32
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