Let me reply one by one.
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First of all,
nvidia-smi
is used normally. I have not tested thetegrastats
command. -
After starting in this way, the integrated GPU will not be able to use graphics mode, it can only work in character mode, just like a dual graphics laptop.
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For battery power supply, the use time depends on the amount of GPU calculations on the one hand, and on the other hand, it depends on whether the extended power supply of the graphics card is provided by batteries.