For me, speedfactor is looking like this (see attachment).
mine is just bright i guess, i messed with my video settings to see if maybe my stuff was just too bright, and checked my gl_modulate,
but gl_modulate doesn't work in dp, sooo, idk why its not dark, i wouldn't want it to be any way, cuss i can see better,
but i noticed its that way at my house and at school, 2 totally different machines and a tad bit different settings, due to performance issues...