linux-kernel - Re: [PATCH 0/11] ACPI: Fixes and cleanups related to iomaps management

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Date:	Mon, 24 Jan 2011 09:13:30 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Len Brown <lenb@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [PATCH 0/11] ACPI: Fixes and cleanups related to iomaps management

On Mon, Jan 24, 2011 at 4:28 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Sunday, January 23, 2011, Jeff Chua wrote:
>> On Sun, Jan 23, 2011 at 3:12 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>> > On Saturday, January 22, 2011, Jeff Chua wrote:
>> >> 2011/1/22 Rafael J. Wysocki <rjw@...k.pl>:
>> >> > On Saturday, January 22, 2011, Jeff Chua wrote:
>> Strange. If I didn't offline, it hanged during suspend even without
>> thinkpad_acpi. I could see that the suspend code does the offline
>> automatically, but executing the offline before calling suspend makes
>> it no hanging.
>
> That means there's a problem in the CPU hotplug code that manifests itslef
> during suspend.  Is this 100% reproducible?  Did it happen with 2.6.37?

Quite reproducible. Once "something" trigger the hang,  no matter how
I reset the system, it'll still hang at suspend. And at other times,
it just worked. I tried many things, but it seems if I go back to use
an earlier version (2.6.37 works perfectly for suspend-to-disk/mem),
then switched back to the newer broken version, it'll work for a few
cycles before hanging at suspend-to-disk.

I guess it could be CPU hotplug, and may be that thinkpad-acpi is
triggering the broken cpu hotplug to fail.

Jeff
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