The lowest power consumption mode 1 is enabled by default when TX2 is turned on，how can I change the default mode to mode 0 instead of change it each time when I start TX2.
assume you’re talking about different Mode-ID in Supported Modes and Power Efficiency.
please change the power mode with
$ sudo /usr/sbin/nvpmodel -m <x> commands;
you may have modification of
nvpmodel.conf to have a custom power mode,