[Devel] Fwd: question about _PTS invocation - mandatory ?

[Devel] Fwd: question about _PTS invocation - mandatory ?

[Yaron Weinsberg]

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Hi Guys,

is it mandatory for the OSPM to invoke _PTS before switching to the S5
state ?

I've noticed that during power loss, the BIOS settings sometimes reset.
E.g. all user settings in the BIOS retrun to their default values.

Could it be related ?

what possibly cause the BIOS to reset its settings ? (the battery is new..)

thanks,
- Yaron

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Re: [Devel] Fwd: question about _PTS invocation - mandatory ?

[Alex Hung]

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Hi,

I checked ACPI spec 5.0 and it states as below:
=========================================
7.3.2 \_PTS (Prepare To Sleep)
The _PTS control method is executed by the OS during the sleep 
transition process for S1, S2, S3, S4, and for orderly S5 shutdown
...
=========================================
So it seems it is mandatory.

On 01/02/2013 03:17 PM, Yaron Weinsberg wrote:
> Hi Guys,
> is it mandatory for the OSPM to invoke _PTS before switching to the S5
> state ?
> I've noticed that during power loss, the BIOS settings sometimes reset.
> E.g. all user settings in the BIOS retrun to their default values.
> Could it be related ?
> what possibly cause the BIOS to reset its settings ? (the battery is new..)
> thanks,
> - Yaron
>
>
>
> _______________________________________________
> Devel mailing list
> Devel(a)acpica.org
> http://lists.acpica.org/listinfo/devel
>

Re: [Devel] Fwd: question about _PTS invocation - mandatory ?

[Zheng, Lv]

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Hi,

> Hi,
> 
> I checked ACPI spec 5.0 and it states as below:
> =========================================
> 7.3.2 \_PTS (Prepare To Sleep)
> The _PTS control method is executed by the OS during the sleep transition
> process for S1, S2, S3, S4, and for orderly S5 shutdown ...
> =========================================
> So it seems it is mandatory.

_WAK is also mandatory.
In Linux, there are different platform ops for "suspend to mem" and "suspend to disk", it's better to have an API provided by ACPICA that can be invoked by both s2m and s2d.

Best regards
-Lv

> 
> On 01/02/2013 03:17 PM, Yaron Weinsberg wrote:
> > Hi Guys,
> > is it mandatory for the OSPM to invoke _PTS before switching to the S5
> > state ?
> > I've noticed that during power loss, the BIOS settings sometimes reset.
> > E.g. all user settings in the BIOS retrun to their default values.
> > Could it be related ?
> > what possibly cause the BIOS to reset its settings ? (the battery is
> > new..) thanks,
> > - Yaron
> >
> >
> >
> > _______________________________________________
> > Devel mailing list
> > Devel(a)acpica.org
> > http://lists.acpica.org/listinfo/devel
> >
> 
> 
> 
> _______________________________________________
> Devel mailing list
> Devel(a)acpica.org
> http://lists.acpica.org/listinfo/devel