[clug] ATX system fan connectors

[Duncan Roe]

Hi everyone,

I finally got around to building lm_sensors (user only, since I have 2.6 kernel)
but I get weird answers from it:

:56:23$ sensors
w83627thf-isa-0290
Adapter: ISA adapter
VCore:     +1.60 V  (min =  +0.70 V, max =  +1.87 V)
+12V:     +12.10 V  (min =  +4.68 V, max =  +4.01 V)       ALARM
+3.3V:     +3.23 V  (min =  +0.03 V, max =  +2.06 V)       ALARM
+5V:       +5.09 V  (min =  +2.13 V, max =  +1.76 V)       ALARM
-12V:     -11.87 V  (min = -14.91 V, max = -14.91 V)       ALARM
V5SB:      +5.08 V  (min =  +0.00 V, max =  +0.35 V)       ALARM
VBat:      +3.42 V  (min =  +2.58 V, max =  +0.00 V)       ALARM
fan1:        0 RPM  (min = 10546 RPM, div = 2)              ALARM
CPU Fan:     0 RPM  (min = 675000 RPM, div = 2)              ALARM
fan3:        0 RPM  (min =   -1 RPM, div = 2)              ALARM
M/B Temp:    +61°C  (high =   +90°C)                     sensor = diode
CPU Temp:  +49.5°C  (high =   +90°C, hyst =   +85°C)   sensor = diode
temp3:     +32.5°C  (high =   +90°C, hyst =   +85°C)   sensor = thermistor
alarms:
beep_enable:
          Sound alarm enabled

This a dual Opteron running 2.6.20.6. There should be 2 CPU temperatures
therefore?
Could sensors-detect have detected the wrong card?
I put this line into modprobe.conf (not modules.conf any more) as suggested by
sensors-detect:

alias char-major-89 i2c-dev

Any ideas for getting sensible output welcomed.

Cheers ... Duncan.

On Sat, Apr 07, 2007 at 08:24:52PM -0700, Michael Still wrote:
> Andrew Janke wrote:
> >> > If you are after a completely software solution to the problem, then I
> >> > think that you probably want to install lm-sensors which includes a
> >> > shellscript called fancontrol. Once installed you use pwmconfig to
> >> > calibrate the fans (it adjusts the voltage and looks for which fan
> >> > slowed down, then it goes through a bunch of voltages asking you when
> >> > the fan stops completely, and when it starts again).
> >>
> >> This sounds cool, and close to what I want (although I assumed the BIOS
> >> did all of that). What controller hardware is used to control the speed
> >> of the fans?
> >
> > fancontrol really is a "suck it and see". The needed hardware is in
> > the motherboard itself (presuming it exists! -- a lot of cheaper MB's
> > skip this stuff). It is also true that most modern BIOS's do support
> > this but usually only for the CPU fan.
> >
> > I know for certain that most Intel based ASUS boards do work and a lot
> > of AMD based ones dont!
>
> Well, now that I've got around to trying my AMD x2 gigabyte board just
> works!
>
> $ sensors
> k8temp-pci-00c3
> Adapter: PCI adapter
> Core0 Temp:
>              +52°C
> Core1 Temp:
>              +49°C
>
> So, what is "too hot" for a CPU core? Oh, and what cable do I need to
> connect from the system fan connector on the motherboard to the fan? Is
> there a limit to the number of fans I can hang off that connector?
>
> Thanks,
> Mikal
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>

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