Hows this for an issue Im in the car. Lights off. Display Dim(may or may not have a bright boot sequence). Go to dimmer control. Shows display is at 100%. Using remote go to 90% gets brighter. Go back to 100%(it may take a couple times back and forth) and its bright. Of course if you are in AC mode you cannot adjust the brightness if it is dim, but I will admit as soon as the temp reaches 25 C the display is fine.