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Date:	Wed, 16 Jun 2010 09:53:00 +0200
From:	Pavel Machek <pavel@....cz>
To:	Len Brown <lenb@...nel.org>
Cc:	Thomas Renninger <trenn@...e.de>,
	linux-pm@...ts.linux-foundation.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] idle-test patches queued for upstream

On Thu 2010-05-27 20:59:07, Len Brown wrote:
> > > ... we think we can do better than ACPI.
> 
> > Why exactly? Is there any info missing in the ACPI tables?
> > Or is this just to be more independent from OEMs?
> 
> ACPI has a few fundmental flaws here.  One is that it reports
> exit latency instead of break-even power duration.
> The other is that it requires a BIOS writer to
> get the tables right.
> 
> Both of these are fatal flaws.

Intel is co-author of ACPI spec, right? So what about fixing those?
 
> > > Indeed, on my (production level commerically available) Nehalem desktop
> > > the ACPI tables are broken and an ACPI OS idles at 100W.  With this
> > > driver the box idles at 85W.
> 
> > What exactly was broken there?
> 
> Dell's BIOS developer botched a bug fix immediately before the system
> went to market and disabled support for all ACPI C-states except C1.
> After several month of shipping systems, they still were unable
> to ship them with a fixed BIOS.

I always thought that cpu vendors have ways to work with bios manufacturers...

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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