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Comment by oefnak | Hacker News Reader

Can you share your script for toggling the video card?

No elaborate script is needed these days, the kernel's runtime power management suspends the card automatically as long as /sys/bus/pci/devices/…/power/control is "auto" and the device isn't being used (the nvidia/nouveau module is unloaded).

Documentation for the nvidia module claims [0] runtime pm is supported even when the module _is_ loaded for GPUs since Turing, but I haven't been able to test that (mine is older than that).

[0] https://download.nvidia.com/XFree86/Linux-x86_64/435.17/READ...

That. I used to use bumblebee, but with recent NVidia drivers it's automatic.

That said, if I want to start a process with using the NVidia driver and card I use this script.

  #!/bin/bash
  __NV_PRIME_RENDER_OFFLOAD=1 \
  __GLX_VENDOR_LIBRARY_NAME=nvidia \
  __VK_LAYER_NV_optimus=NVIDIA_only \
  exec "$@"

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