970A-G/3.1

I have this mainboard, and while it works great, i have one problem.

Right now i am trying to get fan control set up in linux, and the board does report all connected fan speeds as 0.
In windows with speedfan, everything works fine, but i just can't figure it out in linux.

Can someone help me please?

sorry, I misread.

are the fan connected with the old big connector (molex, two wires) or little one (3 or 4 wires). The first one doesn't report the fan speed

lm-sensors is installed and working, and the other readings look fine.
I can see the temps and all.
But the fan speeds are all reported as 0 RPM.
It uses the nct6776-isa driver.

The Output from lmsensors looks like this:

fam15h_power-pci-00c4
Adapter: PCI adapter
power1:       87.47 W (crit = 125.19 W)

amdgpu-pci-0100
Adapter: PCI adapter
fan1:        832 RPM
temp1:        +40.0°C (crit = +0.0°C, hyst = +0.0°C)

k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +14.8°C (high = +70.0°C)
                      (crit = +70.0°C, hyst = +67.0°C)

nct6776-isa-0290
Adapter: ISA adapter
Vcore:          +1.14 V (min = +0.00 V, max = +1.74 V)
in1:            +1.87 V (min = +0.00 V, max = +0.00 V) ALARM
AVCC:           +3.30 V (min = +2.98 V, max = +3.63 V)
+3.3V:          +3.28 V (min = +2.98 V, max = +3.63 V)
in4:            +2.04 V (min = +0.00 V, max = +0.00 V) ALARM
in5:            +1.68 V (min = +0.00 V, max = +0.00 V) ALARM
in6:            +2.03 V (min = +0.00 V, max = +0.00 V) ALARM
3VSB:           +3.44 V (min = +2.98 V, max = +3.63 V)
Vbat:           +3.38 V (min = +2.70 V, max = +3.63 V)
fan1:             0 RPM (min =    0 RPM)
fan2:             0 RPM (min =    0 RPM)
fan3:             0 RPM (min =    0 RPM)
fan4:             0 RPM (min =    0 RPM)
fan5:             0 RPM (min =    0 RPM)
SYSTIN:        +33.0°C (high = +0.0°C, hyst = +0.0°C) ALARM sensor = thermistor
CPUTIN:        +33.5°C (high = +80.0°C, hyst = +75.0°C) sensor = thermistor
AUXTIN:        -61.5°C (high = +80.0°C, hyst = +75.0°C) sensor = thermistor
PCH_CHIP_TEMP:   +0.0°C
PCH_CPU_TEMP:    +0.0°C
PCH_MCH_TEMP:    +0.0°C
intrusion0:    ALARM
intrusion1:    ALARM
beep_enable:   disabled

I do use splitter cables.
All 4 fans on my 240mm liquid cooler are connected to the CPU fan header, for example.
The main point is that i want to control the CPU fans based on core temps, and also system temp. Since these fans are not only cooling the CPU radiator, but also push air into the case, i want them to be controlled based on multiple temps.
This was not too hard to achieve with speedfan on Windows, but i don't know how to achieve the same on linux.

To be honest, i would accept that i don't see the RPM. I don't care too much about that. But i really need to be able to control the PWM outputs with multiple temp sources and custom fan curves.

for istance, to have a low noisy system, with positive pressure inside the case
I set the fans as follows (extract form my work sheet)

     Cpu1     Cpu2     Cha1     Cha2     Cha3     Delta
     CoolerM     Adda     Vultech     Criogen     Vultech     
     1 step                         
tCtrl     60     60     60     60     60     °C
rpm     30%     40%     30%     90%     30%     
cfm     17     (29)     12     40     (12)     27
     2                         
tCtrl     70     70     70     70     70     °C
rpm     50%     50%     50%     90%     50%     
cfm     28     (36)     20     40     (20)     31
     3                         
tCtrl     80     80     80     80     80     °C
rpm     70%     70%     70%     90%     70%     
cfm     39     (50)     28     40     (28)     28
     4                         
tCtrl     90     90     90     90     90     °C
rpm     100%     100%     100%     100%     100%     
cfm     55     (72)     40     44     (40)     27