Fan: Permission denied

I am using a new nano board. I have tried two fans across two card images (including latest) and I consistently get a permission denied error when executing:

sudo sh -c ‘echo 255 > /sys/devices/pwm-fan/target_pwm’
-bash: /sys/devices/pwm-fan/target_pwm’: Permission denied

And ‘sudo jetson_clocks’ does nothing, showing fan at 0.

Any suggestions would be sincerely appreciated.

hello potts.shawn,

may I know which JetPack release you’re working with? I’m able to set target pwm with l4t-r32.4.3/Nano.

nvidia@nano:~$ sudo sh -c 'echo 255 > /sys/devices/pwm-fan/target_pwm'
nvidia@nano:~$ cat /sys/devices/pwm-fan/cur_pwm

could you please also refer to Topic 143759.
you may enable JTop service, which fix the permission denied errors recently.

Thank you! After installing jetson-stats, jtop woke the fan up immediately. I appreciate the tip, it’s a cool tool! (literally)