Re: Standby Mode

A laptop is an entirely different animal. Most manufacturers use their own
power saving, either hardware or software, and that preempts anything that
Windows will try to do. Look to your laptop instructions.

--


Regards,

Richard Urban
Microsoft MVP Windows Shell/User

Quote from George Ankner:
If you knew as much as you think you know,
You would realize that you don't know what you thought you knew!

"Bill Martin" <wylie@xxxxxxxxxxxxx> wrote in message
news:%23rH1hXc8FHA.1000@xxxxxxxxxxxxxxxxxxxxxxx
> Rick "Nutcase" Rogers wrote:
>> Hi Bill,
>>
>> A definition of the various power states:
>>
>> S0 - Up and running
>>
>> S1 - Standby. Drives, display off. Power still on to cpu, fans, ram
>>
>> S2 - Standby. Same as S1, but cpu is powered down
>>
>> S3 - Standby. Power only to refresh ram
>>
>> S4 - Hibernate. No power, contents of ram copied to hard drive before
>> powerdown (hiberfil.sys)
>>
>> S5 - System off.
>>
>> Not all states are supported on all systems, and this is a somewhat
>> simplified view. Some systems, hardware, or combinations thereof will not
>> support any of these states.
>
>>>Unfortunately it still says nothing about whether the CPU
>>>continues to execute code at a reduced rate to keep the scheduler alive
>>>or
>>>not.
>>
>>
>> S1 will execute commands, S2 - S3 will have minimal execution of code
>> (deep
>> sleep), S4 will not execute any.
>>
>>
>>>Or precisely what set of conditions XP looks at to invoke standby. It
>>>does say
>>>it watches the keyboard/mouse of course, but no clue as to whether XP
>>>also
>>>monitors CPU usage for example as a trap to enter standby.
>>
>>
>> Standby is invoked when the system does not detect *user* initiated
>> activity
>> (generally defined as user input from the keyboard, mouse, or other input
>> device), not system generated activity, though there are applications
>> that
>> inhibit standby from kicking in.
>
>
> I saw the S0-S5 list, but it's not inclusive. Many laptops for example
> also
> have states where they slow down the clock to save power. The CPU still
> runs
> but it limps. The S0-S5 list doesn't acknowledge that common approach so
> I
> figured it's usefulness in figuring out when the CPU runs is limited.
>
> To me, when I start up a program that runs 100% CPU for 6 hours, that's
> user
> initiated activity -- but it's not well defined anywhere.
>
> I ran several tests last night. As far as I can tell:
>
> 1) The CPU running intensively does keep the machine alive.
>
> 2) Once it enters standby though, the machine is dead. The scheduler did
> not
> come up to run my backup or virus scans.
>
> Apparently I need some way to have scheduler kick the machine into standby
> after
> it's finished the backups for the night or some such. This gets off into
> the
> arcana of my particular setup I suppose.
>
> Thanks...
>
> Bill


.

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