That's rolling back to 10.8.1 AppleACPIPlatform.kext. Did it fix your backlit?
edit: Thanks, that's a great find ellnic!!! backlit and battery is working will include it in next package. AppleACPIBatteryManager.kext is not needed.
Sorry for delayed reply - the rollback to 10.8.1 ACPI fixes my battery but it doesn't fix my backlit keyboard. I have noticed something else as well, HDMI audio works fine, as long as I stick with the enoch bootloader. I cannot move to another one, but thats no problem, I'll stick with what works
So for me, it's just backlit keys now - oh and woofer...
Armin Van Buuren doesn't quite sound the same without bass
EDIT: This system is getting functional enough to replace my Inspiron 1720 now...
Maybe I should hunt for another G73 on ebay.