Originally Posted by DunMunro
The info display will show the incoming signal, which is the issue here, but the projector itself has to upscale to 4K if the signal is lower than 4K, except in 3D mode.
yes, but that's not what I'm reading as the issue. If the Projector states 2160P 24hz (or 60hz or anything), it's being fed that, it's not upscaling a 1080p signal to 2160p on it's own (whatever happens internally, with XPR is another thing). If Rover is saying the Projector is showing it in 4K (as in the projector states it's in 4K) then it's receiving a 4K signal.
As soon as I send anything 1080p to my UHD51, it states it's receiving 1080p signal, and I can select the 3D menu, and select any 3D format (SBS/Over-under), even when it's not actually receiving a SBS-3D signal. If it's ever receiving a frame-packaged 3D signal (3D Blu-Ray) it automatically switches to 3D mode.
But again, any 1080p signal at all, will allow for the 3D menu to be accessible, the projector will never Upscale anything. So if Rover cannot select the 3D menu, and his Projector is stating 2160p, the issue is with an intermediate device, most likely the Denon X4400 receiver which according to it's manual does upscale any signal to 4K.
Edit: we might be talking past eachother here though