Missing temperature-sensor readings for Asus ROG STRIX B850-F GAMING WIFI with Nuvoton NCT6701D-R

[Mauersegler97]

I have an Asus ROG STRIX B550-F GAMING WIFI motherboard with the Nuvoton NCT6701D-R Super I/O chip.

• sensors-detect identifies the chip as an unknown chip.
• Using the nct6775 driver (which detects the chip as nct6799) allows the fans and voltages to be read correctly.
• However, most of the temperature readings are not meaningful (either +0.0°C or unrealistically low values), and some sensors are missing.
• The TSI0_TEMP reading seems to work and shows the same values as k10temp (the CPU temperature).
• Crucially, there are no sensors shown for the external temperature probe and for the VRM temperature, which are the values I need.

For reference, HW-info in Windows shows these sensors correctly on the board (the external T-sensor is only visible when it is connected). I have attached a CSV export with the sensor details from the board. Although I don't understand much of it, it might be helpful.

Is it possible to add support for this board and/or chip? I am unsure if this is the right place to ask for this. If not, please point me in the right direction.

Some Super I/O chips contain embedded sensors. We have to write to
standard I/O ports to probe them. This is usually safe.
Do you want to scan for Super I/O sensors? (YES/no): y
Probing for Super-I/O at 0x2e/0x2f
Trying family `National Semiconductor/ITE'...               No
Trying family `SMSC'...                                     No
Trying family `VIA/Winbond/Nuvoton/Fintek'...               Yes
Found unknown chip with ID 0xd806
    (logical device B has address 0x290, could be sensors)
Probing for Super-I/O at 0x4e/0x4f
Trying family `National Semiconductor/ITE'...               No
Trying family `SMSC'...                                     No
Trying family `VIA/Winbond/Nuvoton/Fintek'...               No
Trying family `ITE'...                                      No

mt7925_phy0-pci-0900
Adapter: PCI adapter
temp1:        +57.0°C  

spd5118-i2c-14-53
Adapter: SMBus PIIX4 adapter port 0 at 0b00
temp1:        +40.2°C  (low  =  +0.0°C, high = +55.0°C)
                       (crit low =  +0.0°C, crit = +85.0°C)

k10temp-pci-00c3
Adapter: PCI adapter
Tctl:         +82.5°C  
Tccd1:        +81.9°C  

amdgpu-pci-0d00
Adapter: PCI adapter
vddgfx:        1.28 V  
vddnb:         1.25 V  
edge:         +65.0°C  
PPT:          45.05 W  
sclk:         600 MHz 

nvme-pci-0400
Adapter: PCI adapter
Composite:    +25.9°C  (low  =  -5.2°C, high = +82.8°C)
                       (crit = +84.8°C)
Sensor 1:     +27.9°C  (low  = -273.1°C, high = +65261.8°C)

spd5118-i2c-14-51
Adapter: SMBus PIIX4 adapter port 0 at 0b00
temp1:        +41.2°C  (low  =  +0.0°C, high = +55.0°C)
                       (crit low =  +0.0°C, crit = +85.0°C)

nct6799-isa-0290
Adapter: ISA adapter
in0:                            1.24 V  (min =  +0.00 V, max =  +1.74 V)
in1:                          1000.00 mV (min =  +0.00 V, max =  +0.00 V)  ALARM
in2:                            3.41 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in3:                            3.33 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in4:                          1000.00 mV (min =  +0.00 V, max =  +0.00 V)  ALARM
in5:                          688.00 mV (min =  +0.00 V, max =  +0.00 V)
in6:                          1000.00 mV (min =  +0.00 V, max =  +0.00 V)  ALARM
in7:                            3.41 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in8:                            3.28 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in9:                            3.33 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in10:                           1.38 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in11:                           1.12 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in12:                           1.03 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in13:                           1.01 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in14:                         1000.00 mV (min =  +0.00 V, max =  +0.00 V)  ALARM
in15:                         912.00 mV (min =  +0.00 V, max =  +0.00 V)  ALARM
in16:                           1.82 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in17:                           1.28 V  (min =  +0.00 V, max =  +0.00 V)
fan1:                            0 RPM  (min =    0 RPM)
fan2:                         1503 RPM  (min =    0 RPM)
fan3:                            0 RPM  (min =    0 RPM)
fan4:                          406 RPM  (min =    0 RPM)
fan5:                            0 RPM  (min =    0 RPM)
fan6:                          866 RPM  (min =    0 RPM)
fan7:                            0 RPM  (min =    0 RPM)
SYSTIN:                        +31.0°C  (high = +80.0°C, hyst = +75.0°C)
                                        (crit = +125.0°C)  sensor = thermistor
CPUTIN:                        +54.5°C  (high = +80.0°C, hyst = +75.0°C)
                                        (crit = +125.0°C)  sensor = thermistor
AUXTIN0:                       +26.0°C  (high = +80.0°C, hyst = +75.0°C)
                                        (crit = +125.0°C)  sensor = thermistor
AUXTIN1:                        +6.0°C  (high = +80.0°C, hyst = +75.0°C)
                                        (crit = +125.0°C)  sensor = thermistor
AUXTIN2:                       +19.0°C  (high = +80.0°C, hyst = +75.0°C)
                                        (crit = +127.0°C)  sensor = thermistor
AUXTIN3:                       +26.0°C  (high = +80.0°C, hyst = +75.0°C)
                                        (crit = +125.0°C)  sensor = thermistor
AUXTIN4:                       +44.0°C  (high = +80.0°C, hyst = +75.0°C)
                                        (crit = +100.0°C)
PECI/TSI Agent 0 Calibration:  +72.0°C  (high = +80.0°C, hyst = +75.0°C)
AUXTIN5:                       +12.0°C  
PCH_CHIP_CPU_MAX_TEMP:          +0.0°C  
PCH_CHIP_TEMP:                  +0.0°C  
PCH_CPU_TEMP:                   +0.0°C  
TSI0_TEMP:                     +82.6°C  
pwm1:                             128%  (mode = pwm)
pwm2:                              68%  (mode = pwm)
pwm3:                             128%  (mode = pwm)
pwm4:                              26%  (mode = pwm)
pwm5:                              76%  (mode = pwm)  MANUAL CONTROL
pwm6:                              49%  (mode = pwm)
pwm7:                             128%  (mode = pwm)
intrusion0:                   ALARM
intrusion1:                   ALARM
beep_enable:                  disabled

amdgpu-pci-0300
Adapter: PCI adapter
vddgfx:      722.00 mV 
fan1:           0 RPM  (min =    0 RPM, max = 3600 RPM)
edge:         +47.0°C  (crit = +110.0°C, hyst = -273.1°C)
                       (emerg = +115.0°C)
junction:     +48.0°C  (crit = +110.0°C, hyst = -273.1°C)
                       (emerg = +115.0°C)
mem:          +46.0°C  (crit = +108.0°C, hyst = -273.1°C)
                       (emerg = +113.0°C)
PPT:          16.00 W  (cap = 304.00 W)
pwm1:              0%
sclk:         639 MHz 
mclk:          96 MHz 

hwinfo board only.CSV

[martinstark]

given that the last commit to this repository was 4 years ago, I'm thinking this has to be addressed somewhere else, but I also don't know how/where.

I'm having the same problem with Asus b850i, I can see a few temperaturs, but I can't see any fans or pwm sensor modules.

[martinstark]

found this: https://github.com/zeule/asus-ec-sensors

and this issue for amd 800-series motherboards: zeule/asus-ec-sensors#69

[LukasMueller187]

I have the same issue on the B850-G from ASUS with the nct6775: Found NCT6796D-S/NCT6799D-R or compatible chip at 0x2e:0x290

I posted in the issue mentioned by you @martinstark, but answer was there's no ec sensor.
Upstream seems to be https://github.com/hramrach/lm-sensors

Any ideas?