Re: [PATCH] x86/ACPI: Make Sony Vaio Z1 series to use "reboot=pci" default

From: Linus Torvalds
Date: Sat Oct 26 2013 - 16:00:17 EST

On Sat, Oct 26, 2013 at 10:08 AM, Adam Williamson <awilliam@xxxxxxxxxx> wrote:
> Thanks, I'll give it a shot. Note - I suspect some of the other cases
> may really be delays rather than hangs too. It's very easy to look at
> the screen sitting there doing absolutely nothing at all for 30-60
> seconds, lose patience, conclude it's hung, and force a shutdown/reboot.
> Several of the earlier Z1 reporters on the vaio-z mailing list reported
> it as a 'hang', but after I pointed out that it wasn't, confirmed the
> same behaviour on their systems. This could possibly apply to others
> too.

I agree that a delay of 60s may well be reported as a hang, but at
least for the Dell case I can test, the hang is definitely at least
close to infinite. Definitely longer than a couple of minutes.

So the Sony and Dell issues may be different. That said, vt-d was
suspected for both, and apparently does match your kernel versions, so
it's entirely possible that the fundamental cause is the same even if
the symptoms are slightly different.

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