I'm not sure what else dual link can support that would be useful here.
Higher bit depth across the cable. I thought that was one of the assumed? limits when you said:
The argument to me is more about whether it needs to be done with 8 bits or can be done with a higher bitspace
It might just be in the spec as you say.
From page 13 of the DVI 1.0 Spec:
Color depths requiring greater that 24-bit per pixel are allowed to be supported via the second link.
I think it might be possible for a DVI input projector to basically indicate to the sender that they can take the digital component signal (YCbCr) just like an HDMI input though.
I'm not sure but I don't think so. While primarily it's just an encoding and TMDS transmission method, it seems pretty specific in it's encoding method. I've not seen any support for YCbCr in spec or implementation.
DVI / HDMI will both be legacy interfaces soon anyway.
A new TMDS / LVDS differential proposal (Display port or something like that) is on the move and address the mechanical weakness of HDMI and the encoding, bandwidth, audio, and content protection limits of DVI.
so I don't think looking at more things on that disk would help much, as you say.
Agreed. Unless Chris (or someone) can chime in and advise more specifically what we? may be missing here.