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In-reply-to: Your message of "Wed, 03 Oct 2001 01:44:26 BST."
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Date: Tue, 02 Oct 2001 18:04:10 -0700
From: Mike Smith <msmith@freebsd.org>
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Subject: [acpi-jp 1321] Re: Switching the screen off. 
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> On Tue, Oct 02, 2001 at 04:48:18PM -0700, Mike Smith wrote:
> > > Is there a mechanism in place within acpi that would allow me to switch
> > > the screen off instead of blanking it?  I beginning to get worried about
> > > the amount of uptime I have on my laptop :).
> >
> > There isn't, unfortunately.
> >
> > ACPI is glue that lives between parts of the system that are otherwise=20
> > already defined.  Screen and backlight power are typically handled by the=
>
> > video driver, and thus aren't commonly defined with ACPI.
> 
> Doesn't the video subsystem exist in the ACPI hierarchy somewhere?

I think I just said it didn't, right?

> Isn't it possible to identify which device the screen is and power it
> down to a lower power level using the ACPI sequenced defined?

If it's not there, obviously not.

Seriously; it's up to the system BIOS author to provide this 
functionality.  Most don't, based on my experience.
-- 
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also.  But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view.  [Dr. Fritz Todt]
           V I C T O R Y   N O T   V E N G E A N C E


