The guide for gpu passthrough is also available on the forum here Create a Gaming HVM
( For the certificate on my personal website, I am quite opiniated. It is not valid following the rules of WebPKI, but it is valid either using DANE or after importing my CA certificate )
As for fywex issue, if he is not currently trying to do a GPU passthrough and trying to use his IGPU, it could be a CPU/motherboard amperage / voltage issue. The best way of solving that is manually settings the voltage and amperage for main CPU voltage/amperage and SoC using the motherboard BIOS. That what I needed to do on my specific hardware, the motherboard auto adjusted value for amperage/voltage are unstable and unusable.