https://jellyfin.org/docs/general/post-install/transcoding/hardware-acceleration/nvidia#tone-mapping-methods
Has nothing to do with linux and everything to do with your boxes hardware
For SAML yes, but you can use many other options including OIDC without a license.
https://jellyfin.org/docs/general/post-install/transcoding/hardware-acceleration/nvidia#tone-mapping-methods
Has nothing to do with linux and everything to do with your boxes hardware