PWM-fan control and module temperature

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hey,

from this [url]https://devtalk.nvidia.com/default/topic/1032640/jetson-tx2/boolean-fan-control/post/5253775/#5253775[/url] comment:

“Please note that PWM-fan control is bind with the module temperature. You can still control the fan through sysfs. But if the temperature is near the thermalzone, it would be overwritten again.”

It this the only time when it would be overwritten again? As long as the temperature is not near the thermalzone the value I write to /sys/kernel/debug/tegra_fan/target_pwm is not overwritten? Is this correct?

Thanks!

2

robert4f5p3,

Yes, but please note that there are more than one pre-defined thermal zones.

3

Ok, you mean if one of the thermal zones is outside the valid range the PWM value get’s overwritten? Makes sense.

Thanks!

4

Btw is there a documentation for the maximal temperature for each specific thermal zone? If so, where?

Thanks!