linux-kernel - Re: [linux-pm] intermittent suspend problem again

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Date:	Thu, 19 Nov 2009 13:00:00 +0100
From:	Ferenc Wagner <wferi@...f.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm@...ts.linux-foundation.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	yakui.zhao@...el.com, LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [linux-pm] intermittent suspend problem again

Ferenc Wagner <wferi@...f.hu> writes:

> "Rafael J. Wysocki" <rjw@...k.pl> writes:
>
>> On Wednesday 18 November 2009, Ferenc Wagner wrote:
>>
>>> Ferenc Wagner <wferi@...f.hu> writes:
>>> 
>>> Side question: If I run s2disk from the init=/bin/bash prompt, the
>>> instrumentation in acpi_enter_sleep_state_prep in drivers/acpi/acpica/hwsleep.c
>>> fires before the "Snapshotting system" phase, but it does not fire if I
>>> hibernate from the full running desktop.  (That instrumentation was put
>>> there to investigate the KMS-triggered STR freeze.)  What could explain
>>> this?
>>
>> It looks like it uses the "shutdown" method when run with init=/bin/bash, but
>> I don't know why exactly.
>
> Thanks for the tip, I'll check this too.

While looking into this, I found a reproducible kernel panic:

1. boot with init=/bin/bash
2. mount /usr; swapon -a
3. plug in a USB pendrive
4. s2disk (machine goes to sleep)
5. power on, proceed with resuming, press Enter to cancel resume pause
6. ACPI: Hardware changed while hibernated, cannot resume!
   Kernel panic - not syncing: ACPI S4 hardware signature mismatch

Does it make sense?
-- 
Thanks,
Feri.
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