Re: APM sleep vs. ACPI S3 sleep

[Len Brown <len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

On Thu, 2004-05-20 at 13:11, Cam wrote:
> Hi
> 
> APM sleep eg. when running linux 2.4 with the APM behaviour in the BIOS 
> used to suspend the machine, the battery would last for a long time and 
> the machine would be cold to the touch (ie it's at the ambient temperature).
> 
> ACPI S3 sleep looks the same but the battery does not last long and the 
> machine is warm to the touch.
> 
> Has anyone else seen this behaviour? Is it possible that the machine is 
> waking itself periodically or at a certain level of discharge? Is it 
> possible to make the ACPI sleep deeper?

S3 is suspend to RAM, so the processor will be off, but RAM will still
be refreshed; and some devices may still consume power.

S4 is suspend to disk, and it should be as cold this way as S5.

-Len




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