Here's a mind-tickler for ya. It easier to explain through a set of steps:
1) Calibrate a display with a known good meter and known good calibration signal (Blu-Ray or Pattern Generator) directly to the display.
2) Hook up a PC/laptop directly to the same display. Initial configuration on the video card is probably bad and no ICC profile/LUT is used on the system.
3) Try to achieve the same results of the recent display calibration by modifying only the settings on the video card/PC while displaying test patterns off of it.
This should result is a somewhat calibrated video source from the PC, correct? Obviously it's not going to be on-par with a pattern generator.