in file “/usr/lib/python3/dist-packages/Jetson/GPIO/gpio_pin_data.py”:
it says:
# Older versions of L4T have a DT bug which instantiates a bogus device
# which prevents this library from using this PWM channel.
(168, {}, “6000d000.gpio”, 32, 12, ‘GPIO07’, ‘LCD_BL_PW’, ‘7000a000.pwm’, 0),
(38, {}, “6000d000.gpio”, 33, 13, ‘GPIO13’, ‘GPIO_PE6’, ‘7000a000.pwm’, 2),