I did a passthrough from my GPU card. It works very well if I have 2G of RAM but failed with black screen on the the qubes with 4K. (Windows 10 qubes)
I used patching stubdom-linux-root fs (Qubes OS article) but it seems to not work. The name of the qubes is “gpu_GAMES” so no problem with naming…
I tried too to modify /usr/share/qubes/templates/libvirt/xen.xml but it failed too.
Is someone has an idea ?