For nvidia? Alpine Linux. It’s so hard there is 0 support outside of nouveau
(I mean, Alpine uses MUSL instead of GLIBC, so expected)
For AMD? doas apk add linux-firmware-amdgpu mesa mesa-tools vulkan-loaders xf86-video-amdgpu There, you’re good to go(wiki also tells you that)
SteamOS means support for the Steam Linux Runtime, which automatically fills up any standard Linux Distro It’s as good as it gets, and I’m all in for more SteamOS support