Is there any reason to install the nvidia driver in dom0?
I tried installing it for the 1060, and the card doesn’t work with Xen. Don’t know if it’s only an issue with the old cards, but at some point nvidia changed the driver in a way that made it stop working with Xen.
You can’t really use the GPU in dom0, and in terms of just basic video output I don’t know if the nvidia driver is better than the nouveau driver.
I don’t see a reason to use NVIDIA in dom0 at all, unless it’s the only GPU?
For testing purposes, I installed both nouveau and proprietary drivers several months ago without problems. I just remember that on of them gave only a single resolution in dom0.
I couldn’t blacklist the nouveau driver without making a modprobe.d config file, and running dracut --force. This completely disabled video output until xorg was started, to restore graphics during boot I had to add nosplash nomodeset to grub.