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

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Message-ID: <87d4324gp7.fsf@tac.ki.iif.hu>
Date:	Sat, 28 Nov 2009 20:01:08 +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

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> On Wednesday 18 November 2009, Ferenc Wagner wrote:
>
>> Ferenc Wagner <wferi@...f.hu> writes:
>> 
>>> Since I've instrumented s2disk and the hibernation path, no freeze
>>> happened during hibernating the machine.
>> 
>> Not until I removed the delays from hibernation_platform_enter(), which
>> were put there previously to get step-by-step feedback.  Removing them
>> again resulted in a freeze in short course, maybe just two hibernations
>> later.  The instrumentation shows it stuck in dpm_suspend_start(PMSG_HIBERNATE).
>> Does it mean that some device driver is at fault?
>
> A driver or one of the platform hooks.
>
>> I'll check if it always fails at the same point (although tracing into
>> dpm_suspend_start isn't pure fun because of the multitude of devices it
>> loops over).  Is there any way to get printk output from that phase?
>
> Compile with CONFIG_PM_VERBOSE (it does mean exactly that).

The last message now was:

e100: 0000:02:08.0: hibernate, may wakeup

Looks like hibernating the e100 driver is unstable.
-- 
Regards,
Feri.
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