Just a quick question... I normally keep my rMBP docked and on AC power 90% of the time. I have the Thunderbolt display hooked up to the rMBP pretty much all the time as well. When I disconnect the AC power fromt the Thunderbolt display the rMBP immediately goes to sleep, and unless I leave the laptop open (non-clamshell) the Thunderbolt display won't work. Even if I wake the laptop on battery with the Thunderbolt display connected and the lid open, then close the lid the laptop will immediately go back to sleep. Thoughts?