with About this Mac crashes, DSDT Speedstep, Sleep and Sound

I had successfully installed Snow Leopard 10.6 with the "existing Leopard method" on another harddisk.
Now the system is fine except the followings;

1) About This Mac crashes but system profiler works
(Very strange, system profiler works with or without SMBIOS.plist, I tried to install Anv's AppleSMBIOS.kext, About This Mac worked but it takes a long time to boot into the OS. Some suggested this is ACPI-related.)

2) Sleep not working, Harddisks and fans still run when screen goes black
(With SleepEnabler.kext install in /Extra, not sure if the DSDT is patched correctly)

3) SpeedStep not working
(minor issue, won't affect me at all)

4) ALC882 No Sound
(Worked in Leopard with Codec Dump + HDA Patcher, edited the DSDT a few times but still not able to make ALC882 to be recognized as the correct device id)

5) Dual Screen halts at boot
(HD 4850 works as Dual-DVI output, but if both screens are plugged to boot, it fails to load into OS and stuck at blue screen)

My config:
Intel Core 2 Duo E6300 (1.86GHz)
DFI Infinity P965 (ALC882 sound)
4GB of DDR2 in total
ATI HD 4850 512MB (reference board)
WD 250GB SATA2 Harddisk

Chameleon 2.0RC3 + PC EFI 10.5

Attached are my dsdt, extra, system profiler...

Please kindly help:(