New MacBookPro and DisplayID w/two graphics cards

• Trygve Inda New MacBookPro and DisplayID w/two graphics cards Jan 03 2009, 02:05
  The New MacBook Pros have 2 graphics cards. When I get the DisplayID, the
  slow card and fast card differ by 2... ie:
  
  Fast card DisplayID  1234567
  Slow card DisplayID  1234565
  
  (not real numbers)
  
  After switching modes in the Energy System Pref Pane, calls to get the
  DisplayID return the correct results, but the desktop Pref Pane seems to
  still be using the old IDs... Ie if I just switched from slow to fast, the
  IDs used by the desktop pref pane are still the slow IDs... But it works to
  update the desktop.
  
  Is there a way on these machines to get the ID for both cards although only
  one is running at any given time?
  
  I hate to assume it is always going to be "off by 2" although this is true
  for both the internal 15" and the external 24" LED.
  
  Thanks,
  
  Trygve