Translations:NVIDIA/27/en

When you want to run a program on the dGPU, you only need to set a few environment variables for the driver to recognize that offload mode should be used. If hardware.nvidia.prime.offload.enableOffloadCmd is set to true, NixOS will generate a wrapper script named nvidia-offload that sets the right variables for you:

≡︎ nvidia-offload

export __NV_PRIME_RENDER_OFFLOAD=1
export __NV_PRIME_RENDER_OFFLOAD_PROVIDER=NVIDIA-G0
export __GLX_VENDOR_LIBRARY_NAME=nvidia
export __VK_LAYER_NV_optimus=NVIDIA_only
exec "$@"

If everything is configured correctly, then running a program like glxgears should use the iGPU, while running nvidia-offload glxgears should only use the dGPU.