I am seeing strange behavior when adjusting the brightness setting on the eval kit.
Using either a DVI or analog VGA input, when I enable color adjustments by setting the MSB of CP register 0x3E, and then changing CP register 0x3C, I get unexpected changes in the green intensity. For example, if my input is shades of red only, adjusting the brightness will add in green at the higher values. At lower values only red is visible although brighter than expected. If the input is shades of green, the brightness control works perfectly throughout the range.
What am I missing?