ACPI Suspend state

[Proteo]

I recently noticed that my BIOS (see my sig for details) has a parameter called like that. It can be set to S1 state or S3 state. When I use the default value (S3) and put the machine to sleep, all visible activity ceases, and the CPU cooler stops spinning. The PC wakes up fine most of the times (I can even use the Sleep button in my cheap Genius keyboard), but others it doesn't. It seems that everything is working but the screen remains black.

When I use the S3 state, the CPU cooler keeps running, but it seems a bit more reliable. I haven't used it too much but so far it has properly woken the machine up all of the times (just three or four short naps). However now the keyboard Sleep button stopped working. I googled and found this:

 

In ACPI there are six power states: S0, S1, S2, S3, S4, and S5. These states are defined as follows:

 

S0:

the run state. In this state, the machine is fully running.

S1:

the suspend state. In this state, the CPU will suspend activity but retain its contexts.

S2 and S3:

sleep states. In these states, memory contexts are held but CPU contexts are lost. The differences between S2 and S3 are in CPU re-initialization done by firmware and device re-initialization.

S4:

a sleep state in which contexts are saved to disk. The context will be restored upon the return to S0. This is identical to soft-off for hardware. This state can be implemented by either OS or firmware.

S5:

the soft-off state. All activity will stop and all contexts are lost.

 

Do you guys know what's better? I mean, there is something like that in real Intel Macs so we can use the most similar setup, hoping that OS X behaves better?

 

Best regards.

[fireshark]

ACPI is already in macs. Hibernate workarounds in PB s dont work ebcause you need to write to nvram which doesnt exist.