I've been working on tracking down a sleep issue with a new build that I put together.
DX79SR X79 Chipset
Core i7 3930k
Intel 520 series SSD
Windows 8 Pro
System burn-in checks out fine using IBT with stock settings. System is _not_ overclocked.
In a fresh Windows 8 install, the default power mode is 'Balanced' with Hibernation enabled.
_Any_ time the system goes into sleep on its own, Hybrid Sleep is activated. The computer spends some time writing memory to disk, and then the system shuts off--rather than going into sleep mode (blinking power LED), the power LED is completely off. Upon pressing the power button to revive the system, Windows 8 does not resume as expected and goes straight to the normal login screen.
If I turn off Hibernation (using powerctl.exe /h off), the system sleeps and wakes just fine.
Now, I don't know if this is being caused by Windows 8, or the motherboard. I'm posting here to see if anyone else is experiencing the same kind of problem. In addition, it would be nice to get formal support for this issue. I'm fine with non-hibernated Sleep mode, but would rather have a product that works completely.