Re: [lm-sensors] [PATCH] Drivers: hwmon: it87: Add support for ITE

["Gustavo De Nardin (spuk)" <gustavodn@gmail.com>]

* Jean Delvare <khali@linux-fr.org> [2011-11-14 22:45 +0100]:
> On Mon, 14 Nov 2011 19:14:16 -0200, Gustavo De Nardin (spuk) wrote:
> > > On Fri, 2011-11-04 at 00:44 -0400, Frank T. Lofaro Jr. wrote:
> > > > This patch allows the ITE 8728 chip to be detected and used.
> > > > The chip appears to be compatible with the 8721.
> > > > 
> > > 
> > > Can anyone confirm that those chips are actually compatible ?
> > 
> > Unlike forcing the other chips' ids, with force_id=0x8721 PWM control seems
> > to work reasonably, with pwm1_enable=1, pwm1=0 yields around 1132 RPM on the
> > CPU fan, and pwm1%5 yields around 3260 RPM.  Should pwm1=0 actually stop
> > the fan?  I get what (empirically) seem to be consistent logarithmic
> > increase in RPM when increasing pwm1 value, anyway.
> 
> If this is a 4-wire fan then your results are expected. pwm=0 always
> stops 3-wire fans (no power -> stopped) but typically 4-wire fans have
> a minimum speed (speed control is separate from power.)

Yes, this is a 4-wire fan. The chassis fan connector is 3-wire though, and I
can't seem to control the speed of a 3-wired fan by writing to pwm2.


> So it's really a matter of finding the right scaling factors. Easiest
> way in your case if probably to extract them from the DSDT table. See
> http://www.lm-sensors.org/wiki/AsusFormulaHacking for some information
> on this. If you provide the DSDT to myself and Luca we should be able
> to figure it out.

Here: http://spuk.denardin.org/Asus_M5A78L-M-v0603_DSDT.bin

No hurry from me, I'm gonna use asus_atk0110 for reading, and it87 only for
PWM control or now.

I'm trying making sense of the formula in the RVLT method. How can I use
isadump to get the raw values for checking the formula?

Thanks.

t'

-- 
::question = (bool) _2b||!_2b;

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