There has just been a new firmware released for the T2I. Care to make a guess as to whether or not is addresses the AGC?

Canon EOS REBEL T2i / 550D Firmware Update (http://web.canon.jp/imaging/eosd/firm-e/eosdigital7/firmware.html)

Here's what it does:

Fixes a phenomenon in which tone jumps become noticeable
in some images, depending on the shooting scene, when shooting
with the Auto Lighting Optimizer settings (Low / Standard / Strong).

Maybe this also will stop magic lantern update! I hope not I will adopt 'wait and see'