Re: [PATCH] X86: Solve Dell Latitudes do not reboot on x86_64 moregenerally

[Matthew Garrett]

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.

-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx
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