I'm having the same problem. Supposedly DisplayLink allows DDC adjustments but I tried using ScreenBright and it says no compatible monitors detected. Directly connecting my monitor (Dell U2412M) allows me to use ScreeBright fine. Using the latest version of DisplayLink (7.7). Can any DisplayLink employees help clear up this issue?
ScreenBright:
http://www.softpedia.com/get/Desktop...shtml#download
Thanks!