linux-kernel - Re: Fix apparent cut-n-paste mistake in Dell reboot workaround.

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Message-ID: <20130930043213.GA22194@srcf.ucam.org>
Date:	Mon, 30 Sep 2013 05:32:13 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Dave Airlie <airlied@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Dave Jones <davej@...hat.com>,
	x86@...nel.org, Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Fix apparent cut-n-paste mistake in Dell reboot workaround.

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@...f.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@...f.ucam.org
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