We have noticed something strange with the dash in our new 2012 Prius. While driving at dusk and turning the headlights on the dash readout can go completely dark. Leaving only the gear selection indicator visible. This can be completely disorienting and dangerous. This happens if the dimmer wheel is set in the lowest position. It will turn back on if the dimmer wheel is moved up from the lowest setting. I can recreate the issue parked by simply having the headlights on and dimming the switch all the way down. It will shut off the speedometer, MPGmeter, and Hyrbrid indicator screens. I assume this is not normal and is something the dealer can remedy, easily I hope. Does this happent to anyone else?