A follow up to my earlier post about the leds-valve DKMS module, now it is usable within the latest experimental build of OpenRGB itself as long as that leds-valve module is loaded.
Support for the #Valve #SteamMachine under #Linux has been merged into #OpenRGB. This relies on the leds-valve kernel module that is included in the SteamOS kernel. A DKMS package is available to install this kernel module on #Arch and #Debian distros:
https://gitlab.com/CalcProgrammer1/leds-valve-dkms
or AUR leds-valve-dkms-git
In game mode yes, at least during downloads when it uses the LEDs as an indicator. It does not stream effects in software otherwise, it just lets you choose from the built in effects, so OpenRGB can take over without Steam trying to fight it most of the time.