I found sometimes, when the CPU/GPU temperature is over 80(Celsius), the fan PWM is still 0. Then my NX device board’s CPU/GPU temperature is more and more high, at last cause the device power down.
My fan mode is quite.
Why the fan PWN is still 0 when the CPU/GPU temperature is very hight?
We can try cool mode. But the only difference between cool and quite mode should be just the trip point temperature and corresponding hysteresis, rigt?
Where is the code(driver or service) to handle the trip point temperature and corresponding hysteresis? Can we check some logs( If we have or we can enable some logs), or add more logs to debug this issue?
We checked /sys/devices/pwm-fan/target_pwm is 0 when the temperature is very hight, and the fan was not turned on. When I run command echo 255 > /sys/devices/pwm-fan/target_pwm, I saw the fan started to run.