I was not able to get my 9800 GT video card to work with DSDT file. So I had to use EFI string for it. As for the sound, I have not been able to get it to work correctly yet. But it seems a lot of people with ALC889A sound are having problems getting it to work on SL.

Sleep works just fine for me but the only thing is that I cannot wake the computer using mouse/keyboard. I have to press the power button to bring it back up. I guess its not a big deal.