Re: [lm-sensors] Config of P9X79 WS motherboard and its nct6776-isa-0290 sensor

[Guenter Roeck <linux@roeck-us.net>]

On 09/21/2013 05:31 AM, Kent Larsson wrote:
> Hi!
>
> I have a P9X79 WS motherboard and am having some problems with the
> nct6776-isa-0290 sensor. I'll start with most serious problem (where Google
> didn't turn up anything promising), 2 out of 4 fans are reported as 0 RPM,
> even though they are running.
>
> I am running Debian stable which has sensors version 3.3.2 with libsensors
> version 3.3.2. I am using the latest kernel in Debian stable at the time of
> writing, uname -a prints:
> Linux cow 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1+deb7u1 x86_64 GNU/Linux
>
> I have executed sensors-detect and loaded the suggested kernel modules. The
> sensors command prints:
>
> ----/ sensors output start /-----
>
> coretemp-isa-0000
> Adapter: ISA adapter
> Physical id 0:  +39.0°C  (high = +81.0°C, crit = +91.0°C)
> Core 0:         +35.0°C  (high = +81.0°C, crit = +91.0°C)
> Core 1:         +39.0°C  (high = +81.0°C, crit = +91.0°C)
> Core 2:         +36.0°C  (high = +81.0°C, crit = +91.0°C)
> Core 3:         +37.0°C  (high = +81.0°C, crit = +91.0°C)
> Core 4:         +36.0°C  (high = +81.0°C, crit = +91.0°C)
> Core 5:         +35.0°C  (high = +81.0°C, crit = +91.0°C)
>
> nouveau-pci-0100
> Adapter: PCI adapter
> temp1:        +48.0°C  (high = +100.0°C, crit = +110.0°C)
>
> nct6776-isa-0290
> Adapter: ISA adapter
> Vcore:         +0.81 V  (min =  +0.00 V, max =  +1.74 V)
> in1:           +1.02 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
> AVCC:          +3.41 V  (min =  +2.98 V, max =  +3.63 V)
> +3.3V:         +3.39 V  (min =  +2.98 V, max =  +3.63 V)
> in4:           +1.01 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
> in5:           +2.04 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
> 3VSB:          +3.39 V  (min =  +2.98 V, max =  +3.63 V)
> Vbat:          +3.34 V  (min =  +2.70 V, max =  +3.63 V)
> fan1:          978 RPM  (min =    0 RPM)  ALARM
> fan2:         1508 RPM  (min =    0 RPM)  ALARM
> fan3:            0 RPM  (min =    0 RPM)  ALARM
> fan4:            0 RPM  (min =    0 RPM)  ALARM
> fan5:            0 RPM  (min =    0 RPM)  ALARM
> SYSTIN:        +37.0°C  (high =  +0.0°C, hyst =  +0.0°C)  ALARM  sensor =
> thermistor
> CPUTIN:        +41.5°C  (high = +80.0°C, hyst = +75.0°C)  sensor = CPU diode
> AUXTIN:        +31.5°C  (high = +80.0°C, hyst = +75.0°C)  sensor =
> thermistor
> PECI Agent 0:  +32.0°C
> cpu0_vid:     +1.708 V
> intrusion0:   OK
> intrusion1:   ALARM
>
> ----/ sensors output end /-----
>
> As you can see there are no "div" in any of the output, which I understand
> means that changing the divisor won't help?
>
> I have screenshots of my BIOS (upgraded to latest version) and an annotated
> picture of the actual machine inside here:
> http://forums.debian.net/viewtopic.php?f=10&t=107523&p=512640#p512640
>
> That link also contains sensors-detect output and my complete
> /etc/sensors3.conf as I thought they were a bit too large to post in this
> message. Let me know if that conclusion was wrong, in which case I'm sorry
> and I'll paste them here.
>
> I am willing to help out any way I can to improve lm-sensors support for my
> motherboard. It's supposed to be a nice motherboard, so improved
> compatibility would hopefully be of value for lots of users.
>
> Thank you for reading this post! I would greatly appreciate some help as I
> am pretty dumbfounded when it comes to this problem.
>

The NCT6776 does not have fan divisor registers.

Couple of things to try:

1) Try using the asus_atk0110 driver. ASUS exports environmental data through ACPI,
    so that is the preferred method to get the the information for ASUS boards.
    [ Which makes me wonder. Do you have "acpi_enforce_resources=lax" configured
      your boot command line ? ]
    If that does not work, please send a copy of /sys/firmware/acpi/tables/DSDT.
2) Try setting the minimum fan speed to something reasonable. Odd, though, that
    the BIOS reports minimum speeds but the driver reports 0.
3) Try using other fan connectors. I understand the board has a total of 6 connectors.
    Since the chip can only monitor a total of 5 fan inputs, it is possible that ASUS
    uses a multiplexer to be able to read the speed of two of the fans. Since we don't
    know about that, it won't work for us.
4) Install and use the driver from https://github.com/groeck/nct6775.

We can go from there if nothing of the above works. Next step would be to dump all
registers from the SuperIO chip.

Guenter


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