Re: Something wrong with support for NCT6776F in w83627ehf driver

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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
> 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
> 
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> lm-sensors@xxxxxxxxxxxxxx
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