This is my story. I have a Dell Inspiron 1520 with Core2Duo 1.66 CPU and 4GB DDR2 and GeForece 8400M GS 128MB. I installed OS X 10.6.3 from retail DVD, used Chameleon as bootloader, then updated to 10.6.4. Almost everything works fine, except shutdown and sleep.
Putting the computer to sleep, it goes to sleep, but after a 1 or 2 seconds wakes up automatically. So this is a no go.
The other problem is that when I shutdown the computer, apparently everything is close, but the power led is still on and I have to push the power button for 6 seconds to turn it off completely.
Both CPU cores work fine, video card works fine @ full resolution, audio works, wireless work, ethernet work, bluetooth work, media buttons work.
In /Extra/Extensions I have these kexts: EvOreboot.kext, FakeSMC.kext, IOAHCIBlockStorageInjector.kext, NullCPUPowerManagement.kext and SleepEnabler.kext.
In /System/Library/Extensions I have these kexts: AppleBCM440XEthernet.kext, IOBluetoothFamily.kext, IONetworkingFamily.kext, OSXRestart.kext, AppleACPIPS2Nub.kext, VoodooPS2Controller.kext, VoodooBattery.kext, VoodooHDA.kext and VoodooSDHC.kext.
All these kexts were installed by me, since some of them are for running in 64 bit mode.
If I disable the GraphicsEnabler then the shutdown work as it should, but as soon as I enable it, shutdown brakes. Also pressing the power button brings up the dialog box for selection options to restart, sleep or shutdown. However restart work just fine.
Could someone help me out with this? I would really appreciate some help, since I'm struggling with these problems for almost a month now.
PS: I also uploaded the DSDT extracted from the system, if it helps