sleep / wake-up

[Guennadi Liakhovetski]

On Sat, 10 Jun 2006, Lee Revell wrote:

> It seems that PPC Macs have a hardware PMU:
> 
> http://www.resexcellence.com/linux_icebox/01-31-02.shtml
> 
> And that some embedded devices handle this at the hardware level with no
> OS support needed:
> 
> http://ozlabs.org/pipermail/linuxppc-dev/2001-February/010179.html
> 
> So AFAICT there's no standard like ACPI - each board does it
> differently.

Right, so, without such support in the hardware or without the appropriate 
information all you can do is software suspend-to-disk, I think. That's 
for sleep-states. And just for power-saving you can switch various parts 
off in subsystem-specific ways (e.g., spin down a IDE hd), clock the CPU 
down, but still keep your system __running__, i.e. all processes run just 
as usual only slower.

Thanks
Guennadi
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Guennadi Liakhovetski