USB Power Control

Please check [Kernel Customization] in Documentation

My fan doesn’t turn. I don’t know what’s tx2 have Overheat protection?

My fan turns on when it starts, and then it doesn’t turn. This problem occurred in the newly installed system.jetpack 3.3,im use tx2 with J120,and installed J120 drive of 1.6。
what’s the problem of tx2‘s fan?

The fan does not normally run. Unless the system produces enough heat it never kicks in (you might see a very slight flicker at the moment of power on). On the other hand, the J120 would require a different device tree, and if that isn’t correct, then the fan would not work. Unlike a desktop PC this wouldn’t be instant death, but it would end up overheating at some point during a heavy workload.

What do you see from:

sudo cat /sys/kernel/debug/tegra_fan/target_pwm

A “0” is auto speed control. This would force the fan to max:

sudo echo 255 > /sys/kernel/debug/tegra_fan/target_pwm

This would put the fan back into auto mode:

sudo echo 0 > /sys/kernel/debug/tegra_fan/target_pwm

If the device tree is not in, then either the files won’t exist or won’t do as expected.