Button background lighting turns off while in the desktop cradle.
Gee, thanks a lot Moto. It's not like we haven't been screaming for this since the initial GB update. As trivial as it may seem to some, this was the main reason why I shelved my X after the initial update and switched to a Pre2 (great phone btw, just to small of a screen as 4.3" has me spoiled).
Day late and a dollar short though thanks to an app for rooted users called adj brightness. Liberty rocks, and I'll never go back to stock again. This Liberty build has been so stable, my old Nokia 3360 dumbphone would have been jealous.
Suck it Moto! Your hardware is top notch but your software blows. But I'm not bitter