From: Matthew Garrett <mjg59@srcf.ucam.org>
To: "H. Peter Anvin" <hpa@zytor.com>
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
Date: Thu, 9 Dec 2010 22:51:42 +0000 [thread overview]
Message-ID: <20101209225142.GA25215@srcf.ucam.org> (raw)
In-Reply-To: <4D015ACF.1050105@zytor.com>
On Thu, Dec 09, 2010 at 02:40:15PM -0800, H. Peter Anvin wrote:
> On 12/09/2010 02:38 PM, Matthew Garrett wrote:
>>> Windows doesn't get validated on old hardware.
>>
>> XP does this, and older hardware predates the version of the ACPI spec
>> that introduced this flag.
>>
>
> ACPI is very buggy on early implementations, presumably because WHQL had
> not yet been extended to include it. That is exactly why we combine
> these kinds of things with a date check.
I'm afraid I don't understand your argument. The date cutoff would be on
the order of 2001 (anything after this will have been tested with XP).
The spec that defines this behaviour only came into existence in August
2000, and any older hardware will be missing the flag that indicates
that this feature is supported. It doesn't seem realistic to believe
that there's any real body of hardware that sets the flag but otherwise
has a broken implementation.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2010-12-09 22:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-09 21:46 [PATCH 1/3] X86: Revamp reboot behaviour to match Windows more closely Matthew Garrett
2010-12-09 21:46 ` [PATCH 2/3] ACPICA: Fix access width for reset vector Matthew Garrett
2010-12-09 22:41 ` Rafael J. Wysocki
2010-12-09 23:12 ` H. Peter Anvin
2010-12-09 23:26 ` Matthew Garrett
2010-12-09 21:46 ` [PATCH 3/3] ACPI: Bug compatibility for Windows on the ACPI reboot vector Matthew Garrett
2010-12-09 22:36 ` H. Peter Anvin
2010-12-09 22:41 ` Rafael J. Wysocki
2010-12-09 22:25 ` [PATCH 1/3] X86: Revamp reboot behaviour to match Windows more closely H. Peter Anvin
2010-12-09 22:32 ` Matthew Garrett
2010-12-09 22:32 ` H. Peter Anvin
2010-12-09 22:38 ` Matthew Garrett
2010-12-09 22:40 ` H. Peter Anvin
2010-12-09 22:51 ` Matthew Garrett [this message]
2010-12-09 22:53 ` H. Peter Anvin
2010-12-09 22:58 ` Matthew Garrett
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20101209225142.GA25215@srcf.ucam.org \
--to=mjg59@srcf.ucam.org \
--cc=hpa@zytor.com \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox