I915ovmfrom Upd 'link' -

Boot the VM and install your guest operating system (Windows or Linux). For Windows guests, you will need to install the official Intel Graphics drivers from Intel's website. For Linux guests, the i915 driver will be used and should work automatically.

: This flag activates both Graphics Microcode (GuC) submission and Video Microcode (HuC) parsing. This is critical for offloading scheduling logic from the CPU during concurrent hardware transcoding tasks.