This patch series implements suspend to idle. It was developed on github
Suspend to idle is like s3 except instead of using ACPI to suspend and resume,
it simply idles the CPU. Please see the commit messages on github for a
description of the individual changes. In short, you mean specify S0IDLE for
certain sysctls to enable the support.
For example, sysctl hw.acpi.suspend_state=S0IDLE, will make acpiconf -s3 use
suspend to idle instead of the default (NONE or S3).
On top of this series will be support for s0ix (emulated s3), and then after
that, hopefully some sort of runtime power management. Emulated S3 support is
"done" and being debugged is here: