[Bug 535197] [NEW] fancontrol does not work for Intel DG41TY / w83627ehf

[sk]

Public bug reported:

Hi,

I am using Ubuntu 2.6.31-14.48-server x86_64 and the Intel DG41TY
mainboard (http://ark.intel.com/Product.aspx?id=37164). I want to run
the machine as "home-server" (text mode only). So it has to be as quiet
as possible. Because the fans (CPU-fan and 2 case fans) produce a lot of
noise (and have fixed rpm), I want to switch them off until temp gets to
high.

I am doing experiments on the subject for the first time, so please
forgive, if this report is caused by beginners mistakes.

1) I checked the biosoptions 
CPU Fan Control - Enable
System Fan Control - Enable
Lowest Fan Speed - Off

2) I followed this guide : http://wiki.ubuntuusers.de/Lm_sensors
I am sorry it is german. Summarize :

2.1) sudo sensors-detect (answering all questions with y)
       senso-detectd added following line to /etc/modules  :
       coretemp
2.2) Finaly running sensors didn't shows me all the information I expected.

3) I discovered, that I have to load the module w83627ehf, so I removed
coretemp from /etc/modules and inserted w83627ehf instead.

4) Running sensors, seems to work for all information I needed ( rpm,
and temp ). The shown values seem to be valid.

5) Now I wanted to start configuring fancontroll, following the guide (german again) :
http://wiki.ubuntuusers.de/L%C3%BCftersteuerung
Summarize :
5.1) sudo pwmconfig 
No fan was switched off by pwmconfig.

5.2) I discoverd that nearly every value outputed by sensors was marked with "Alarm". In case of rpm the reason was the min rpm rate which was to high, I changed this by adding the lines under chip "w83627ehf-*" "w83627dhg-*":
set fan1_min 0
set fan2_min 0
set fan3_min 0
to /etc/sensors3.conf The Alarm disappeard. sudo pwmconfig sill didn't control any fan.

6) I found the doc :
http://www.mjmwired.net/kernel/Documentation/hwmon/w83627ehf
And started writing values to /sys/devices/platform/w83627ehf.2576/pwm[1-4]. e.g 
echo 0 > /sys/devices/platform/w83627ehf.2576/pwm2
echo 2 > /sys/devices/platform/w83627ehf.2576/pwm2_enable

Reading values - is ok. Writing also works, but has no effect on fan activity.
At this point, I give up. I dont know what else I could try. May be you can give me some hint, whether this is a problem of my hardware or a bug ...

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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fancontrol does not work for Intel DG41TY / w83627ehf 
https://bugs.launchpad.net/bugs/535197
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