[coreboot] What is needed in dsdt to enable S4(Besides \_S4)

[Stefan Reinauer]

* Bao, Zheng <Zheng.Bao at amd.com> [110316 09:38]:
> I have \_S4 in my dsdt.asl.  But the dmesg only reports:
> 
> ACPI: (supports S0 S1 S2 S3 S5)
 

> So what else is needed?
 
I think you also need to add S4BIOS_REQ in the FADT and implement an SMM
handler to handle it.

You don't need that for software suspend to disk though

Stefan