linux-kernel - Re: [PATCH] X86: Solve Dell Latitudes do not reboot on x86

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Date:	Mon, 7 Nov 2011 16:09:54 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-acpi@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH] X86: Solve Dell Latitudes do not reboot on x86_64 more generally

On Monday, November 07, 2011 03:27:40 PM Matthew Garrett wrote:
> On Mon, Nov 07, 2011 at 03:25:13PM +0100, Thomas Renninger wrote:
> > On Monday, November 07, 2011 02:59:24 PM Matthew Garrett wrote:
> > > On Sat, Nov 05, 2011 at 01:44:03AM +0100, Thomas Renninger wrote:
> > > > There are quite some reports that those do not reboot:
> > > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/833705
> > > > ->E6520, E6220
> > > > http://www.linux-club.de/viewtopic.php?f=29&t=114459&start=20
> > > > ->E5520
> > > > and some more already are blacklisted
> > > 
> > > It's a bug in the SMM code on these machines, and it goes away if you 
> > > disable VT-D. Let's try to actually fix it
> > How do you intend to fix that?
> > From description above it sounds as if this problem is not
> > fixable from OS side.
> 
> Tear down VT-D state before reboot.
But doing this for all X86 machines because of a handful of
Dells with broken SMM code sounds wrong as well.

Doesn't Dell ship with Ubuntu pre-loaded?
Can't someone point them to this to get this fixed in BIOS?

   Thomas
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