On Wed, Jun 11, 2008 at 09:01:14AM +0800, Huang, Ying wrote: > On Tue, 2008-06-10 at 14:01 -0400, Len Brown wrote: > > > > On Tue, 10 Jun 2008, Huang, Ying wrote: > > > > > This patch implements devices state save/restore before after kexec. > > > > > > > > > This patch together with features in kexec_jump patch can be used for > > > following: > > > > > > - A simple hibernation implementation without ACPI support. You can > > > kexec a hibernating kernel, save the memory image of original system > > > and shutdown the system. When resuming, you restore the memory image > > > of original system via ordinary kexec load then jump back. > > > > What part of ACPI's role in hibernation are you trying to avoid > > 1. enabling wake devices > > 2. removing power from the system > > 3. something else? > > ACPI S5 is used instead of S4 for this simple hibernation > implementation. That is, before creating the hibernation image, the ACPI > _PTS is not executed, devices are not put into low power state and wake > devices are not enabled. After creating the hibernation image, the image > is saved to disk and system is shutdown (go to S5). When resuming from > hibernated image, ACPI _BFS and _WAK are not executed too. Hi huang, Can't we implement ACPI S5 state as an option in current hibernation framework? Or kexec jump is a requirement for that? Thanks Vivek _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
