Nvidia-smi volatile gpu-util 0% on RHEL8 with A40 GPU

Trying to configure A40 on new computer. After installing CUDA/drivers, testing with VirtualGL shows no GPU activity in nvidia-smi. nvidia-settings also shows 0% activity.
Specs are below:

OS - RHEL 8.9
CUDA Toolkit - 12.2
GPU model - A40
Driver - 535-154-05