_S0D and \_S0?

After doing some more analysis, on ASL, it appears some systems (Dell) have _S0D methods under devices. It appears the OSPM should run those at runtime when deciding to change the power state for a device. Here's an example:

            Device (USB3)
                Method (_S0D, 0, NotSerialized)
                {
                    Store (SMI (0x85, 0x00), Local0)
                    And (Local0, 0x01, Local0)
                    If (LEqual (Local0, 0x00))
                    {
                        Return (0x03)
                    }
                    Else
                    {
                        Return (0x00)
                    }
                }
                Name (_S1D, 0x02)
                Name (_S3D, 0x02)

This appears to say "if transitioning to another power state and the system is up and running (i.e. S0), the device must always be powered off (0x03) if bit 0 of SMI 0x85 is clear. Otherwise, any power state is fine (0x00)".

Additionally, some machines have non-zero values for \_S0. Should we be writing these values to the wake register at some point?

asl/vaio.asl:Name(_S0_, Package(0x4) {

asl/vaio.asl-    0x5,
asl/vaio.asl-    0x5,
asl/vaio.asl-    0x0,
asl/vaio.asl-    0x0,

Comments welcome.

-Nate

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