Unfortunately, I have not sorted this out. At this time I am unsure if there is a solution with my current NEC Multisync 3090WQXi and Dell M4600 laptop running SpectraViewII. I ended up loading Win7 on my old desktop (for Lightroom) and am using a DVI-D cable between the DVI-D connection on the graphics card to the NEC DVI-D connector. This connection apparently supports the needed EDID and DDC_CI communication protocol required by SpectraViewII, and worked with WinXP previously, as I reported in my original post. I am not totally happy with this arrangement because my desktop is a bit dated with an Intel Core 2 Duo CPU and it bogs down running Lightroom.
What I believe you need is a Dual Link DVI-D capability on your laptop graphics card that gets carried out through the port replicator. My laptop is lacking the Dual Link DVI-D connector and the DVI-D connectors on my port replicator are apparently not dual link. So, if, like me, you have only a Display Port on your laptop and are lacking the fully functional (i.e., supports the EDID and DDC_CI communication protocol required by SpectraViewII) Dual Link DVI-D connector on your port replicator, I believe you will be in the same boat as me and out of luck.
I believe on their newer monitors, NEC now uses a USB cable to carry the required EDID and DDC_CI communication protocol required by SpectraViewII between the monitor and the computer. This arrangement circumvents the need for the Dual Link DVI-D pathway to carry the EDID and DDC_CI communication protocol, and would allow me to run with the Display Port to Dual Link DVI-D adapter which I purchased. Unfortunately, this option is not available on the older NEC monitors like mine. I suspect, your 2690 is similar to my 3090 in that regard.
I have toyed with the idea of selling my 3090 and upgrading to one of the newer NEC monitors just so I can run Lightroom on my laptop without it bogging down so much. It does seem a shame to have to do this with an otherwise perfectly functional monitor, and for that reason I have not yet gone in that direction.
I hope I have helped. If you find a solution to this, I would certainly appreciate hearing back from you, perhaps by private email. I try to check this post from time to time, but it hasn't aroused much attention.