linux-kernel - Re: [PATCH v2] acpi: Fix regression where _PPC is not read at boot even when ignore

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Message-ID: <20090428202409.GU7917@plum>
Date:	Tue, 28 Apr 2009 13:24:12 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Thomas Renninger <trenn@...e.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, cpufreq@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2] acpi: Fix regression where _PPC is not read at boot
	even when ignore_ppc=0

On Tue, Apr 28, 2009 at 08:53:48PM +0100, Matthew Garrett wrote:
> On Tue, Apr 28, 2009 at 12:33:04PM -0700, Darrick J. Wong wrote:
> > On Thu, Apr 16, 2009 at 11:45:07PM +0100, Matthew Garrett wrote:
> > 
> > > That's not really an option. It works with Windows.
> > 
> > Who verified that?  Does anyone know what strategy Windows uses to avoid this
> > T60 problem?  
> 
> The best guess was that Windows only evaluates _PPC when it receives a 
> notification.

I have asked the Windows side of the UEFI development team here about what
they've observed about Windows' behavior regarding reading _PPC at boot and
will post their answers when I receive them.

--D
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