When the TX2 is powered on, it will run at graph mode, I have to use “control+alt+F1” to switch the tty1 mode manually.
Now I want to let the TX2 work at tty1 after power on automatic, who can tell me how to do?
Do you mean that you want the TX2 to NOT start the Ubuntu desktop at boot? Not sure if it works on Tegra, but you could try this: https://askubuntu.com/questions/825094/how-do-i-boot-directly-to-tty1-in-ubuntu.
If you want to completely disable the GUI try this:
sudo systemctl disable lightdm.service sudo chmod -x /usr/sbin/lightdm
Or to re-enable:
sudo systemctl enable lightdm.service sudo chmod +x /usr/sbin/lightdm
Do keep in mind there are some applications GPU applications which want the GUI (or a virtual version) running.