From mboxrd@z Thu Jan  1 00:00:00 1970
From: "siva" <sivakumar.subramani-uxC5H9eHYlcAvxtiuMwx3w@public.gmane.org>
Subject: Keybaord and power button.
Date: Fri, 20 Jun 2003 09:10:03 +0530
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To: "Adachi, Kenichi" <adachi-fvZ7ij+YLgEZc9YY0SgeQc8NsWr+9BEh@public.gmane.org>, 'Derek Broughton' <dbroughton-F3m4/jXepmf3fQ9qLvQP4Q@public.gmane.org>, acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
List-Id: linux-acpi@vger.kernel.org

Hi,

I have doubt regarding the power button.
With out keyboard connected to the linux machine, Is it possible to do
gracefull shutdown of my machine by just pressing the Power button.

Thanks,
Siva



----- Original Message -----
From: "Adachi, Kenichi" <adachi-fvZ7ij+YLgEZc9YY0SgeQc8NsWr+9BEh@public.gmane.org>
To: "'siva'" <sivakumar.subramani-uxC5H9eHYlcAvxtiuMwx3w@public.gmane.org>; "'Derek Broughton'"
<dbroughton-F3m4/jXepmf3fQ9qLvQP4Q@public.gmane.org>; <acpi-devel@lists.sourceforge.net>
Sent: Tuesday, June 17, 2003 4:55 PM
Subject: RE: [ACPI] Query regarding the linux ACPI


> Hi,
>
> > That means this option can be programmed in the BIOS and we
> > can have it as
> > option in the BIOS.
> > Am I right ?
> >
>
> Power button override is done at hardware level as Derek pointed out and
> what you have to look into is the Datasheet of your chipset.
>
> For example, ICH4 Datasheet says:
>
>   2.10 Power Management Interface
>   Table 2-10. Power Management Interface Signals
>
>   <Quote>
>   PWRBTN#
>       :
>   If PWRBTN# is pressed for more than 4 seconds, this causes an
> unconditional transition (power button override) to the S5 state with
> only the PWRBTN# available as a wake event. Override occurs even if the
> system is in the S1-S4 states. This signal has an internal pull-up
> resistor.
>   </Quote>
>
> Thanks,
> - Adachi, Kenichi
>



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