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
255
FYI,
could you please also refer to Topic 143759.
you may enable JTop service, which fix the permission denied errors recently.
thanks