1. Editing the name of the input will likely affect the default settings, but you can apply those settings back if you want. The labels treat the incoming signal differently, so that more devices are supported with (hopefully!) less hassle.
2. Did you have the TV professionally calibrated? To directly answer the question, each input has its own settings, so a calibration would have to be applied to each input.
3. Not all devices send a xvYCC signal. If that signal isn't detected, the option isn't available.
Does that help?
I have the LN46B630 and hooked it up to my HTPC. I use a DVI to HDMI cable on HDMI1/DVI to hook it up to the HTPC. I changed the label of the input to "DVI PC" (as it seemed the most appropriate) and found that many of the calibration settings were greyed out. I then changed the label to just "DVI" and I noticed the picture change slightly (not sure what it was, maybe sharpness or something else). Even though the settings were exactly the same, there was a slight discernible difference when changing the input name. I tried another input ("PC") and the picture changed slightly again.
So two questions:
1. Are the technical or image differences between input labels documented somewhere? What is it about the DVI PC settings that make the text look so good? Is it possible to replicate the settings applied in "DVI PC" with the other labels?
2. If these settings cannot be replicated, is there a way to retain control over all calibration settings for certain input labels?
In my personal opinion, "DVI PC" looked better for the text on the screen, but I don't like that I lost so many color adjustment settings (color, color space, black tone, etc.) with it.
P.S. Why is xvYCC greyed out in every label and setting mode? Does the source have to be outputting xvYCC colors before the setting is enabled?
Thanks for the help!