Linux command to disable GPU.

# You need to replace xx by your device id, you can find it using nvidia-smi command

# To disable it
nvidia-smi -i 0000:xx:00.0 -pm 0
nvidia-smi drain -p 0000:xx:00.0 -m 1

# To re-enable it:
nvidia-smi drain -p 0000:xx:00.0 -m 0