APM sleep vs. ACPI S3 sleep

APM sleep vs. ACPI S3 sleep

[Cam]

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?

-Cam
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camilo-Nk/s8sJ9yP7QXOPxS62xeg@public.gmane.org                                                 <--


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Re: APM sleep vs. ACPI S3 sleep

[Len Brown]

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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Re: APM sleep vs. ACPI S3 sleep

[Cam]

Len

> 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.

The machine is now running with more memory than the BIOS was claimed to 
support, maybe this warmth in suspend is a side effect? Some 
misconfiguration of the memory? Increasing the memory and moving to 
ACPI/2.6 happened about the same time.

I don't think the machine supports S4 but I will be trying the linux 
software suspend stuff soon.

-Cam

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camilo-Nk/s8sJ9yP7QXOPxS62xeg@public.gmane.org                                                 <--


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Re: APM sleep vs. ACPI S3 sleep

[Pavel Machek]

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?

Probably some driver forgot to place its hardware to proper sleep.
Try to find out exactly what produces heat.
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