I use Tx2 EVB. I add to rc.local the call script:
jetson_clocks.sh jetson_clocks.sh --show >> /home/nvidia/log.txt
I can see in file log.txt that all cores receive MinFreq equal to MaxFreq.
When I connect to the board with ssh, I can see that the setting is overwritten by some other program.
I have to note that I disabled ondemand script by using:
sudo update-rc.d -f ondemand remove