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Date: Mon, 30 Sep 2013 05:32:13 +0100
From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Dave Airlie <airlied@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Dave Jones <davej@redhat.com>,
        x86@kernel.org, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Fix apparent cut-n-paste mistake in Dell reboot workaround.
Message-ID: <20130930043213.GA22194@srcf.ucam.org>
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On Mon, Sep 30, 2013 at 01:15:02PM +1000, Dave Airlie wrote:
> On Mon, Sep 30, 2013 at 1:06 PM, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
> > Likely indicates that our ACPI reboot handling still isn't bug
> > compatible with Windows. We'd do better fixing that than adding more DMI
> > entries.
> 
> are these only with VTd enabled? I have some Dells that won't reboot
> with VTd turned on, I remember you though it was an acpi bug we
> couldn't do much with.

Oh, that's true - the ACPI reboot vector on the Dell tables I have to 
hand appears to be via the keyboard controller, so there's probably some 
SMM involved. I don't know if the VTd thing is still a problem (David 
Woodhouse was looking into that at one point), but that would be a 
reasonable point to start from.

-- 
Matthew Garrett | mjg59@srcf.ucam.org
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