linux-kernel - Re: [RFC][PATCH 0/3] PM: Asynchronous suspend and resume

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Date:	Fri, 14 Aug 2009 17:21:17 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [RFC][PATCH 0/3] PM: Asynchronous suspend and resume

On Fri, 14 Aug 2009, Rafael J. Wysocki wrote:

> On Friday 14 August 2009, Alan Stern wrote:
> > On Thu, 13 Aug 2009, Rafael J. Wysocki wrote:
> > 
> > > > No, I've only tested it with a few selected drivers.  I'm going to try the
> > > > "async everyone" scenario, though.
> > > 
> > > On HP nx6325 booted with init=/bin/bash it doesn't pass the
> > > 'echo devices > /sys/power/pm_test && echo mem > /sys/power/state' test.
> > > 
> > > The suspend part actually seems to work, but the resume part crashes
> > > miserably.
> > 
> > Any details?  Can you tell where it crashes?
> 
> Unfortunately it ends up in a continuous flood of backtraces, so I can't
> say much.

Same sort of thing happened with me, but it appeared to happen during 
suspend.  (I say "appeared" because the system froze for a while at the 
start of the suspend until I hit a key.  This may be related to all the 
recent churn in the TTY layer, combined with the fact that I was using 
a serial console.  It didn't help -- none of the backtraces got sent 
out the serial port.)

> However, if I set async_suspend for all PCI devices, as well as for ACPI battery
> and i8042, everything apparently works, even with real suspend-resume.

I think it would be worthwhile to track down these unknown problems and 
dependencies.  It won't be easy, though...

Alan Stern

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