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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 -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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