For the adusio try the solution from Buhgalter from the Asus K50IN topic - http://osx86.co/f47/asus-k50in-t4409/page10.html
I have the same problem with the shutdown - the computer shuts down the screen, but remains ON like in some kind of stand by mode! I have to turn it off from the button. If you find something about this problem, please let me know.

Kind regards