I got a Samsung NP900X3A Ultrabook (http://www.samsung.com/de/support/model/NP900X3A-A01DE) with Intel® HD Graphics 3000 and an external Samsung SyncMaster SA450 24" screen. I plug the external screen into the micro HDMI with a VGA adapter. My problem is, that I can only set up the screen to run with 1440x900 resolution. I installed drivers etc. but no change. Is there anything I can do to get the full resolution the screen is capable of? Do I need to buy a HDMI to Micro HDMI cable?