linux-kernel - Re: Problems with suspend and USB storage

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Message-ID: <20080516120437.GC22264@elf.ucw.cz>
Date:	Fri, 16 May 2008 14:04:37 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Bill Nottingham <notting@...hat.com>, linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: Problems with suspend and USB storage

Hi!

> > I've been testing suspend/hibernate with various USB devices under
> > 2.6.25.2. Test box is a Thinkpad T60 (uhci, ehci).
> > The results are somewhat dismal.
> > 
> > Using USB as a hibernate device:
> > - A directly connected USB stick works OK as a hibernate device
> > - A directly connected USB hard drive works OK as a hibernate device
> > - A USB stick connected via an ExpressCard reader does not - it appears
> >   to just not be there when the hibernate code attemps to write
> >   the data.
> > 
> > On resume (from either hibernate or suspend from RAM):
> > - Any 'in use' USB storage, whether it be as swap (a hibernate device),
> >   or a mounted filesystem, immediately generates errors on resume. It
> >   appears the filesystem and/or swap tasks are woken up before the
> >   actual USB device - it enumerates the disks after the errors have
> >   already been thrown.

swsusp or uswsusp?

Does strategic delay help?
									Pavel
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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