From how well they’ve done with their upstreams, like the kernel and Mesa, I expect they will happily accept patches from their downstream

Valve hires lots of developers to improve graphics drivers for all Linux users

SteamOS is currently on kernel 6.1, a lot of the changes they’ve made have gotten merged into upstream which is at 6.7

A few changes they’ve made for their specific hardware have ended up causing regressions for other hardware, so it still needs more code review and testing before everything is completely upstream

HoloISO appears to be a rebuild from source of SteamOS

“Holo” is the code name for the current SteamOS version