Gregory's Server@benpocalypse @gamingonlinux Digital Foundry got ray tracing working in a number of games, some of them even performed decently at reduced resolutions, but they had to install Windows to get it working.
You'd likely have to REALLY crush the resolution for Portal RTX though. The only other path traced game they tested was Quake 2 RTX, which they had to drop to 252p resolution to get to 60fps.
Doesn't really sound worth the effort.
@slemhundy @gamingonlinux Oh well. A boy can dream.
Thanks for the detailed info!