jetson_clocks still sets max clock rate for the given power mode as it used to. It’s just fan is no longer set to max speed by default. Fan on Jetson AGX Xavier will start to spin at 68C (first trip temperature: 50 C + 18C hysteresis). Complete thermal spec. can be found in power management document
If you prefer old behavior of jetson_clocks, please use --fan option which sets max fan speed:
jetson_clocks –fan
You can refer to power management document for details.