[lm-sensors] smsc47m1 FAN problem on MS-6796 chipset Intel 865G

[gmitra@upjs.sk (Martin Gmitra)]

> Hi Martin,
> 
> I will use english so other people might profit from solution.
> Please dont forget to reply  (or just CC) to the lm-sensors address.
> 
> > Ahoj!
> > Obraciam sa na VAs s prosbou o pomoc. Mam motherboard MS-6797 a dopatral 
> > som sa, ze FAN senzor je SMSC LPC47M15x. Problem je, ze oba FANy bezia na 
> > maximalne otacky a neviem ich nijako regulovat. Do jadra 2.6.11 som napatchoval
> > linux-2.6.12-rc3-i2c-smsc47m1-select-pwm-clock.diff
> > a prekompiloval modul, vyzera to takto:
> 
>  For non native czech or slovaks I will translate. WHen he do PWM enable fans will stop. He uses that patch backported to 2.6.11
> to have clock selection sysfs interface.
> 
> > i2c_isa                 1920  0
> > smsc47m1                9996  1
> > i2c_sensor              3072  1 smsc47m1
> > i2c_core               18704  3 i2c_isa,smsc47m1,i2c_sensor
> > 
> > obraz drivera
> > 
> > ls -l /sys/bus/i2c/devices/0-0800/
> > 
> > -r--r--r--  1 root root 4096 Jun 10 14:14 alarms
> > -rw-r--r--  1 root root 4096 Jun 10 14:13 detach_state
> > lrwxrwxrwx  1 root root    0 Jun 10 14:13 driver ->
> > ../../../../bus/i2c/drivers/smsc47m1
> > -rw-r--r--  1 root root 4096 Jun 10 14:14 fan1_div
> > -rw-r--r--  1 root root    0 Jun 10 14:20 fan1_input
> > -rw-r--r--  1 root root 4096 Jun 10 14:14 fan1_min
> > -rw-r--r--  1 root root 4096 Jun 10 14:14 fan2_div
> > -r--r--r--  1 root root 4096 Jun 10 14:14 fan2_input
> > -rw-r--r--  1 root root 4096 Jun 10 14:14 fan2_min
> > -r--r--r--  1 root root 4096 Jun 10 14:14 name
> > drwxr-xr-x  2 root root    0 Jun 10 14:13 power
> > -rw-r--r--  1 root root    0 Jun 10 14:14 pwm1
> > -rw-r--r--  1 root root    0 Jun 10 14:17 pwm1_clock
> > -rw-r--r--  1 root root    0 Jun 10 14:21 pwm1_enable
> > -rw-r--r--  1 root root    0 Jun 10 14:32 pwm2
> > -rw-r--r--  1 root root    0 Jun 10 14:17 pwm2_clock
> > -rw-r--r--  1 root root    0 Jun 10 14:45 pwm2_enable
> > 
> > 
> > Utilita pwmconfig zlyha, zastavi oba FANy a neviem ich znova nahodit pomocou
> pwmconfig will fail to get two fans back and this wont help:
> 
> > echo 1 > pwm1_enable
> > echo 1 > pwm2_enable
> 
> > Restartujem stroj aby sa neuprazil procesor.
> 
> He will restart the machine so the procesor wont die.
> 
> > Neviete poradit kde by som sa blizsie dopatral k informaciam? Ci sa niekomu
> > podarilo spravit speed regulaciu a ako merat teplotu CPU na tejto doske?
> > Nateraz viem zapnut a vypnut FANy. Dakujem.
> 
> He asks about temperature and other stuff and how to regulate it with temps.
> 
> Please run sensors-detect command to see what chips you have. Your chip has also a HW monitor block but i think it is not yet supported.
> And also I think nobody is working on that. If you want to fund or donate the motherboard or write the support by yourself we can discuss it in further emails.
> 
> And now I will try to write something about the solution.
> 
> Do t the same without the patch? ( I guess so)
> 
> What will happen if you do after thay are stopped:
> 
>  echo 0 > pwm1_enable
>  echo 0 > pwm2_enable
> 
> Will they spin again? (I think you made a mistake in description)
> 
> 
> Please try with the power off/boot:
> What will happen when you do:
> 
>  echo 1 > pwm1_enable
>  echo 1 > pwm2_enable
> 
> echo 255 > pwm1
> echo 255 > pwm2
> 
> echo 0 > pwm1
> echo 0 > pwm2
> 
> Will they spin again? If so your fans are polarity inverted so 0 is full speed.
> 
> If it does not help you can try:
> To play with the pwm1_clock and pwm2_clock
> This are valid possibilites:
>  40, 60, 80, 120, 15625, 23438, 31250, 46876
> You can echo them similar way as the values above.
> I would suggest to pick up some higher frequency to the beginning.
> 
> I hope this will help.
> 
> Regards
> Rudolf


Hi,

I have compiled kernel-2.6.12-rc6 with patch
linux-2.6.12-rc3-i2c-smsc47m1-m15x-m192-support.diff
and installed lm_sensors-2.9.1.
I don't know how next solution is affected by patching.

Using sensors-detect gives:
No i2c device files found. Use prog/mkdev/mkdev.sh to create them.
After creating appropriate /dev/i2c-x I run sensors-detect.
The process didn't detect sensors expect (after starting
/etc/init.d/lm_sensors start)
odule                  Size  Used by
i2c_isa                 1920  0
i2c_core               18064  1 i2c_isa

As you see, the list doesn't contain smsc47m1 module as I expected.
So I continued loading by hands, modprobe smsc47m1
lsmod
Module                  Size  Used by
smsc47m1                8968  0
i2c_sensor              3072  1 smsc47m1
i2c_isa                 1920  0
i2c_core               18064  3 smsc47m1,i2c_sensor,i2c_isa

sensors 
command gives:
smsc47m1-isa-0800
Adapter: ISA adapter
fan1:        0 RPM  (min = 5120 RPM, div = 1)
fan2:        0 RPM  (min = 2560 RPM, div = 2)

Image of the driver si located at:
/sys/bus/i2c/devices/0-0800/
where are files as follows:
-r--r--r--  1 root root 4096 Jun 10 18:55 alarms
lrwxrwxrwx  1 root root    0 Jun 10 18:55 bus -> ../../../../bus/i2c
lrwxrwxrwx  1 root root    0 Jun 10 18:55 driver -> ../../../../bus/i2c/drivers/smsc47m1
-rw-r--r--  1 root root 4096 Jun 10 18:55 fan1_div
-r--r--r--  1 root root 4096 Jun 10 18:55 fan1_input
-rw-r--r--  1 root root 4096 Jun 10 18:55 fan1_min
-rw-r--r--  1 root root 4096 Jun 10 18:55 fan2_div
-r--r--r--  1 root root 4096 Jun 10 18:55 fan2_input
-rw-r--r--  1 root root 4096 Jun 10 18:55 fan2_min
-r--r--r--  1 root root 4096 Jun 10 18:55 name
drwxr-xr-x  2 root root    0 Jun 10 18:55 power
-rw-r--r--  1 root root 4096 Jun 10 18:57 pwm1
-rw-r--r--  1 root root 4096 Jun 10 18:57 pwm1_enable
-rw-r--r--  1 root root 4096 Jun 10 18:57 pwm2
-rw-r--r--  1 root root 4096 Jun 10 18:57 pwm2_enable

Stopping and working in the maximum regime can be done by
echo 0 > pwm1_enable
echo 0 > pwm2_enable
echo 1 > pwm1_enable
echo 1 > pwm2_enable

The speed regulation can be controled writing a value from the range
0 - maximal speed, to 255 - stop spining, the polarity is reversed.

Sorry Rudolf, but I don't understand you how can I play with pwmX_clock?
I have files as listed above only. What is the fan speed? Is it possible
to measure it?

Thank you Rudolf for your advice. I lowered speed of fans and I can
hear my typing fingers on keyboard, uhfff!

I read somewhere that my chip has HW block. I don't know if I will be able to write
support, but I can try. If you have any advice how to start, I will be glad.

Cheers,
Martin