Bumping this old thread because I need to calibrate a new Mac Book Pro (running Lion) with external NEC Spectraview monitor (2490wuxi2). I wish to run both monitors at the same time. I have Spectraview II with an I1DisplayPro puck for the NEC and I1profiler for the Mac. Glad to see Mac OS supports dual profiles. Any gotchas with such a setup? Earlier this year I tried the same thing with a Windows 7 laptop and got myself into a whole heap of trouble. Took me months to figure out how to fix my situation. I am hoping for smooth sailing this time.
Also, I notice in the display preferences box for the laptop there is a checkbox for 'automatically adjust brightness'. I take it I want this unchecked?
I have to skip the Mac questions you have, but I can say you definitely need to turn off 'automatically adjust brightness'. That feature sounds like it has a luminosity sensor, and will adjust the brightness of the screen based off the current lighting conditions. Changes in the brightness level will invalidate the color accuracy you're striving for.