fans

view sensor data

sensors

detect sensors

sensors-detect

configure pwm control

pwmconfig

front two fans on headroom

Testing pwm control hwmon5/pwm2 ...
  hwmon5/fan2_input ... speed was 2268 now 1161
    It appears that fan hwmon5/fan2_input
    is controlled by pwm hwmon5/pwm2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9