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Date:	Wed, 11 Nov 2009 12:29:33 +0100
From:	Ferenc Wagner <>
To:	"Rafael J. Wysocki" <>
	Jesse Barnes <>,
	Andrew Morton <>,, LKML <>,
	ACPI Devel Maling List <>,
	Len Brown <>
Subject: Re: [linux-pm] intermittent suspend problem again

"Rafael J. Wysocki" <> writes:

> On Thursday 29 October 2009, Ferenc Wagner wrote:
>> "Rafael J. Wysocki" <> writes:
>>> On Wednesday 28 October 2009, Ferenc Wagner wrote:
>>>> 2.6.32-rc5 feels particularly bad, with frequent failures to switch
>>>> off the machine after "S|" or freezes after "Snapshotting system".
>>>> The former does not cause much trouble in itself, as the machine can
>>>> be switched off and resumed all right, but the latter is nasty.
>>>> Suspend to RAM works all the time.  The issue is not reproducible,
>>>> unfortunately, and the kernel change happened almost together with a
>>>> BIOS upgrade.  Yesterday I switched back to 2.6.31 to see whether it
>>>> still works stably with the new BIOS.  I'll report back my findings in
>>>> a couple of days.
>>> OK, thanks.
>>> Still, I'm really afraid we won't be able to debug it any further without a
>>> reproducible test case.
>> Can't you perhaps suggest a way forward there?  Or some tricks to create a
>> reproducible test case here?
> Well, you can test if the problem is reproducible in the "shutdown" mode of
> hibernation.

Well, both failure modes happen with "shutdown" mode as well (the S|
freeze with yesterday's git, too), but still not reproducibly.  When
s2disk is stuck in "Snapshotting system", the system is not completely
dead, it echoes line feeds and Ctrl-C at least (as added to #14504).

I wonder what you did if the issue was reproducible...  Is that totally
unapplicable if the problem happens with 10% probability only?  Slow,
sure, but until I manage to set up an automated testing bench...
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