My 2006 car had an independent brightness setting for the infotainment screen but that's likely because the infotainment system just wasn't as fully integrated

My 2006 car had an independent brightness setting for the infotainment screen but that's likely because the infotainment system just wasn't as fully integrated into the car as it is today. It wasn't a touchscreen so since everything had a button, you could have easily designed it to use a VFD or similar.