Re: [lm-sensors] Something wrong with support for NCT6776F in

From: Guenter Roeck <guenter.roeck@ericsson.com>
To: lm-sensors@vger.kernel.org
Subject: Re: [lm-sensors] Something wrong with support for NCT6776F in
Date: Mon, 31 Oct 2011 05:07:45 +0000	[thread overview]
Message-ID: <20111031050745.GA15235@ericsson.com> (raw)
In-Reply-To: <4EA9CECA.4050007@gmx.de>

On Mon, Oct 31, 2011 at 12:57:36AM -0400, Guenter Roeck wrote:
> Hi Soeren,
> 
> sorry for the late reply. Busy ...
> 
> On Thu, Oct 27, 2011 at 05:36:10PM -0400, Soeren D. Schulze wrote:
> > I have an ASRock H67M-ITX motherboard.
> > 
> > The w83626ehf driver detects:
> > 
> > [ 3904.608693] w83627ehf: Found NCT6776F chip at 0x290
> > 
> > "sensors" shows me:
> > 
> > coretemp-isa-0000
> > Adapter: ISA adapter
> > Physical id 0:  +46.0°C  (high = +80.0°C, crit = +98.0°C)
> > Core 0:         +46.0°C  (high = +80.0°C, crit = +98.0°C)
> > Core 1:         +45.0°C  (high = +80.0°C, crit = +98.0°C)
> > Core 2:         +46.0°C  (high = +80.0°C, crit = +98.0°C)
> > Core 3:         +46.0°C  (high = +80.0°C, crit = +98.0°C)
> > 
> > nct6776-isa-0290
> > Adapter: ISA adapter
> > Vcore:         +0.96 V  (min =  +0.00 V, max =  +1.74 V)
> > in1:           +0.18 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
> > AVCC:          +3.39 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
> > +3.3V:         +3.39 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
> > in4:           +0.54 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
> > in5:           +1.69 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
> > 3VSB:          +3.41 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
> > Vbat:          +3.31 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
> > fan1:            0 RPM  (min =    0 RPM)  ALARM
> > fan2:         2180 RPM  (min =    0 RPM)  ALARM
> > SYSTIN:        +42.0°C  (high =  +0.0°C, hyst =  +0.0°C)  ALARM  sensor 
> > = thermistor
> > CPUTIN:       +127.5°C  (high = +80.0°C, hyst = +75.0°C)  ALARM  sensor 
> > = thermistor

Followup: In my system, the CPU sensor type is reported to be a diode.
Wonder if that is relevant.

Guenter

> > AUXTIN:        -24.0°C  (high = +80.0°C, hyst = +75.0°C)  sensor = 
> > thermistor
> > PECI Agent 0:  +46.5°C
> > cpu0_vid:     +2.050 V
> > intrusion0:   ALARM
> > intrusion1:   ALARM
> > 
> > 
> > Here, CPUTIN and AUXTIN (whatever it is) are obviously wrong.  CPUTIN 
> > *decreases* towards 17°C when the CPU gets hot (non-linearly, though).
> > 
> Odd. No idea what is going on, though. The registers are quite straightforward,
> and the same for NCT6775F and NCT6776F. And it works on my system with NCT6775F.
> 
> > This was the first problem.  The second problem occurs when I try to 
> > control fan2 manually.  The "pwm2" file in sysfs is 255 for anything 
> > above 2000 RPM, but as you can see above, the fan can do more (I've been 
> > at 2600 RPM -- maybe it can do even more), but pwm2 stays at 255.
> > 
> Looking through the datasheet, I did not find anything obvious. It might
> be possible that the PWM output frequency (register 2 bank 0) somehow affects
> the fan speed as well. What causes the fan speed to go higher in your system ?
> 
> Guenter
> 
> > 
> > I'm using the Debian Linux kernel 3.0.0-3, but the same problem occurs 
> > when I pull the latest w83626ehf.c file from git.
> > 
> > 
> > Hope this was a tiny bit helpful.  If I can help you finding the source 
> > of this problem, please tell me.
> > 
> > Sören
> > 
> > _______________________________________________
> > lm-sensors mailing list
> > lm-sensors@lm-sensors.org
> > http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
> 
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