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

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Message-ID: <87r5rwrkqs.fsf@tac.ki.iif.hu>
Date:	Wed, 18 Nov 2009 15:05:47 +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:

> 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?  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?

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?
-- 
Thanks,
Feri.
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