With -2 brightness, the overhead stages are pitch black and you literally can't see anything except when you pause the game or go to the map. At -1 they are incredibly dark but just about playable. I'm pretty sure the transient fix also makes the top section of the screen where your weapons are disappear, although this may simply be a further side effect of the brightness adjustment. Otherwise, this feature is excellent, but unless it's something specific to my device or I've done something wrong, this likely means there will be other games that don't run properly with this setting. The DKC games in particular look beautiful on a 1 chip without the overblown brightness.
Apologies if this is the wrong place to post stuff like this.