okay , so when i connect the mb air 2011 13" , and if my laptop is open... the max resolution i seem to be getting is 2048x1152. when i close my laptop, i get the full thunderbolt resolution of 2560x1440 . the question is... why ? why can't i keep my laptop open for better venting and still enjoy this full resolution on the display? why do i have to clamshell it? also, when i play games... it seems to stutter... but when i play them on my mba , they work flawless... is it that the air can't handle a crazy resolution like this? please help. not to mention, my display just happened to turn off randomly. WHATS GOING ON APPLE?