From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 10/10] x86, ACPI: default to reboot via ACPI (again)
Date: Thu, 13 Nov 2008 17:22:42 -0800
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To: Zhao Yakui <yakui.zhao@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>, Avi Kivity <avi@redhat.com>, Ingo Molnar <mingo@elte.hu>, Len Brown <lenb@kernel.org>, Stephen Rothwell <sfr@canb.auug.org.au>, Andrew Morton <akpm@linux-foundation.org>, Matthew Garrett <mjg@redhat.com>, Andrey Borzenkov <arvidjaar@mail.ru>, "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>, "Brown, Len" <len.brown@intel.com>, Thomas Gleixner <tglx@linutronix.de>, Eduardo Habkost <ehabkost@redhat.com>

Zhao Yakui wrote:
> I do the test as required. First the 0x02 is written to 0xCF9 I/O port.
> The return value by reading the 0xCF9 I/O port is 0x02. Then the 0x06 is
> written to the 0xCF9 I/O port. The screen becomes black but the box
> can't be rebooted.

What is the value of the CF9 port before you do anything?

	-hpa