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It could be conflict between VirtualSMC and FakeSMC (check that you have only one of them in both EFI and /Library/Extensions) and in my case it has been caused by obsolete sensor kext (I used legacy NVidia sensor kext for very old GPU and then after graphic card upgrade the system started crashing)

Article: Apple issues OS X 10.8.2 and 10.7.5 Supplemental Updates GA-H77-DS3H, Intel Core i5-3570K, Internal Graphics, no DSDT. Unable to boot after update, kernel panic, error: "CPU 3 has no HPET assigned to it". Kext in backtrace -- AppleIntelCPUPowerManagement Boot parameters darkwake=10...

Sorry for misleading, the reason for immediate awake was the USB2/USB3 all-in-one card reader/front panel USB-hub (ICY BOX 3.5"). Without this cardreader all the functions are working fine ;) Funny side -- exactly the same cardreader does not produce any problem in Linux, seems to be that sleep...

Thanx for tip, that was IcyBox Card Reader/USB Hub. I wonder, why it works fine in Linux and does not in OSX... Could actually certain combination of "darkwake" flags solve the issue? Kirill

This MB is working fine, nearly out-of-the-box with UniBeast ML and subsequent DSDT-free MultiBeast install, including 'native' sound (you should use recent Realtek ALC887 codec). The only problem I ran into with this motherboard is the caveat with sleep. It goes sleep, bit wakes up immediately...

GA-H77M-D3H (DSDT-free installation), almost same behavior, goes sleep (from power switch, keyboard or via menu) switches off all the fans/lights and then in 5 sec wakes up again. I've checked with watt meter, it definitely goes into less than 2 Watts mode, but for some reason wakes up...