Wasn't sure exactly which forum to put this in.
I'm using a switcher to send all my sources to two displays (plasma and projector). Since each display just gets the one HDMI, I need to make sure all the sources have the same black level so I don't have to go into menus every time I switch sources to adjust the black level from PC to TV (or standard to expanded or whatever the display calls it).
Unfortunately my Comcast RNG110 cable box doesn't have a control for this. It outputs at TV levels 16-235. I would set everything else to this too, except custom 2.35 resolutions on my PC are stuck at 0-255 and thus all that stuff has crushed blacks. There is a registry hack that supposedly switches all resolutions to use the same black range, but for whatever reason, it doesn't seem to work.