It returned without error when I changed the number. Should it do anything else? Haven't tried using it in SD-2.0 yet. Don't tell me. All the LEDs and knobs work in the game now yeah?
New kernels are a lot easier now that I don't get the apport errors on the nvidia kernel module. I get full resolution right after reboot now, so happy to carry on testing, but that's about it isn't it?
ETA: Wait! "brightness"??!