The idea would be two monitors, keyboard, and mice connected to one PC so two people could play games on the same beefy computer at the same time. To avoid issues with steam detecting another instance running, it would be great if the two users were isolated from each other in some way. Also ideally avoiding the need to purchase a second beefy GPU. So PCI-passthrough is out, as you’re giving exclusive access to the GPU in the VM (some GPU support virtualization, but my 9070 xt does not). My understanding is that multi-seat as described here for systemd https://wiki.debian.org/Multi_Seat_Debian_HOWTO should be able to do this as you can have two user logged in at the same time, but this require each seat to have its own dedicated GPU for display. The docs from debian seem to suggest the DRI_PRIME may still work to use the other GPU. I am curious if anyone has tried this before and knows if it works I go around buying a cheap secondary GPU.

VNC seems like an interesting idea, I wonder what the latency would be like for

How do you do it with x? I would be interested in looking at this.

I think in theory it could be done in Wayland if a compositor implements multi-seat support. There is a fork of wlroots & labwc in this repo that seems like it’s trying to do that https://github.com/garlett/multiseat