Just picked up my car yesterday and while driving it home, I was trying to figure out why the gauges were super-bright when I turned my headlights off, but when I turned them on, they were really, really dim. Turns out my sales rep pressed the dimmer switch without me noticing. :sarc
There's more than 2 settings. The button near the gauges toggles between "night" and "day" modes. When you're in "day" mode, the lights are very bright and cannot be dimmed with the dimmer switch that's located near your left knee (on US models). When you're in "night" mode, the lights are noticably dimmer, even with the dimmer switch at it's brightest position. In "night" mode, you can also use the dimmer switch to adjust the lights to the desired level. For me, it's a great feature to have since I like to drive with my lights on during the day. I can have it in "day" mode and be able to read my gauges.