Originally Posted by
ilp1972 
Configuring the XBOX:
Connecting the XBOX connected to any of the HDMI ports, I found the XBOX "takes over" the KD/KDE's Picture Settings, due to Discovery Mode being set to ON within the XBOX display settings, so that there most menu options were no longer available on the KDE, and there is no advanced control over color calibration, etc. Instead, only Backlight, Contrast, and Brightness are available. The results in a disturbing SOE with or without Game Mode enabled on the KDE. I resolved the issues primarily by disabling Discovery Mode through the following steps:
Settings --> Console Settings --> Display --> Display Discovery --> Disable
After doing so, the XBOX restarted in 480SD, and a whole host of new resolutions became available under HDTV Settings. I then I set the XBOX to 1080p:
Settings --> Console Settings --> Display --> HDTV Settings --> 1080p
I could see no difference between the three available Reference Levels, so I have left them set to Standard:
Settings --> Console Settings --> Display --> Reference Levels --> Standard
I tried the various settings for HDMI Color Space, and find that simply leaving it set to Auto works perfectly insofar as it appeared to adjust the color settings between Dark Knight Rises DVD and Red Dead Redemption situations, where as I felt that the DVD was somehow washed out when I forced HDMI Color Space to RGB. YMMV on this one.
XBOX Console Settings Display Menu
HDTV Settings: 1080p
Screen Format: (greyed)
Reference Levels: Standard
HDMI Color Space: Auto
Display Discovery: Disabled
M3D550KDE TV Settings for selected XBOX HDMI Input
Game Mode: On
---Picture Settings Menu---
Picture Mode: Custom
Backlight: 43
Brightness: 45
Contrast: 48
Color: 55
Tint: 1
Sharpness: 7
---Size & Position Submenu---
[no change]
---Color Temperature Submenu---
Color temperature: Custom
Red Gain: 48
Green Gain: 49
Blue gain: 50
Red offset: 49
Green offset: 48
Blue offset: 50
--Advanced Picture Submenu---
Noise Reduction: Off
MPEG NR: Off
Color Enhancement: Off
Adaptive Luma: Extend
Film Mode: Off
Ambient Light sensor: Off
I used the above Calibration settings for the KDE, and set Game Mode to ON under TV Settings of the KDE, but could see no difference in lag, as there appears to be none whatsoever in either mode, which I attribute to the disabling of all the post-processing in the Advanced Picture Settings.