Fan PWM won't be changed after set /sys/devices/pwm-fan/target_pwm

In my code, I will set /sys/devices/pwm-fan/target_pwm to adjust the fan speed. But I found after my code set /sys/devices/pwm-fan/target_pwm, this fan pwm won’t be changed again, even the temperature is down to very low like 30C. I suppose the fan should stop( fan PWM = 0) when temperature is down to 35C. Fan mode is cool mode.

Is this NX devkit or some custom board?

It is NX devkit.

Which JetPack version

Jetpack 4.6 [L4T 32.6.1]

Tracking at Fan PWM is 0 when CPU/GPU temperature is over 80 - Jetson & Embedded Systems / Jetson Xavier NX - NVIDIA Developer Forums

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