Yeah I’m fairly certain it’s a permission issue. Having the gpu with permissions 666 makes it work inside the containers.
The thing is also that these container images (plex and jellyfin) create a separate user inside, instead of using the root user, and this new user (“abc” for lsio images) doesn’t get added to the same groups as the root user.
Also the render group that gets passed to the container appears as “nogroup”, so I thought of adding user abc to “nogroup” but still didn’t seem to work.