Well topic says it all. I don't know if it's Mountain Lion or the retina MacBook Pro, but for me the automatic brightness adjust doesn't seem to work anymore(dont know if it ever worked though, as this machine was new and installed ML on it). Tried to reset PRAM and SMC (though I dont know if it has resetted SMC memory.. there is no feedback).. still no luck.. if i sit in a dark room and had the brightness at 100% before i rebooted my MBP, it will happily reboot with 100% brightness. kinda sucks. I just tried it out with my old non-retina mac book pro. Same thing. With Mountain it seems like the brightness adjustment doesn't work anymore.. anybody else has this issue?