Message-ID: <4D015914.1040009@zytor.com>
Date: Thu, 09 Dec 2010 14:32:52 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Matthew Garrett <mjg59@srcf.ucam.org>
CC: x86@kernel.org, linux-acpi@vger.kernel.org, lenb@kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] X86: Revamp reboot behaviour to match Windows more
 closely
References: <1291931204-5854-1-git-send-email-mjg@redhat.com> <4D015741.7090500@zytor.com> <20101209223201.GA23894@srcf.ucam.org>
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On 12/09/2010 02:32 PM, Matthew Garrett wrote:
> On Thu, Dec 09, 2010 at 02:25:05PM -0800, H. Peter Anvin wrote:
>> On 12/09/2010 01:46 PM, Matthew Garrett wrote:
>>> Windows reboots by hitting the ACPI reboot vector (if available), trying
>>> the keyboard controller, hitting the ACPI reboot vector again and then
>>> giving the keyboard controller one last go. Rework our reboot process a
>>> little to default to matching this behaviour, although we'll fall through
>>> to attempting a triple fault if nothing else works.
>>>
>>> Signed-off-by: Matthew Garrett<mjg@redhat.com>
>>
>> When this was discussed before we agreed to use ACPI reboot by default
>> with an ACPI cutoff date; this doesn't have any such cutoff.
>
> Windows doesn't either. Older machines simply won't have the appropriate
> flag set in their FADT.
>

Windows doesn't get validated on old hardware.

	-hpa

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