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

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Message-ID: <CA+55aFxwLuw=OTtn_u5Tk00xXbuSe6GAiTJ=UiySkr4E2CBAGw@mail.gmail.com>
Date:	Sat, 26 Oct 2013 13:00:03 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Adam Williamson <awilliam@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Joerg Roedel <joro@...tes.org>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Dave Jones <davej@...hat.com>,
	Lan Tianyu <tianyu.lan@...el.com>,
	Matthew Garrett <mjg@...hat.com>, Peter Anvin <hpa@...or.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Robin Holt <holt@....com>, davej@...oraproject.org,
	Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/ACPI: Make Sony Vaio Z1 series to use "reboot=pci" default

On Sat, Oct 26, 2013 at 10:08 AM, Adam Williamson <awilliam@...hat.com> 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.

                    Linus
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