From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [PATCH 1/3] X86: Revamp reboot behaviour to match Windows more closely Date: Thu, 09 Dec 2010 14:32:52 -0800 Message-ID: <4D015914.1040009@zytor.com> References: <1291931204-5854-1-git-send-email-mjg@redhat.com> <4D015741.7090500@zytor.com> <20101209223201.GA23894@srcf.ucam.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from terminus.zytor.com ([198.137.202.10]:48548 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752630Ab0LIWc6 (ORCPT ); Thu, 9 Dec 2010 17:32:58 -0500 In-Reply-To: <20101209223201.GA23894@srcf.ucam.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Matthew Garrett Cc: x86@kernel.org, linux-acpi@vger.kernel.org, lenb@kernel.org, linux-kernel@vger.kernel.org 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 >> >> 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