Re: Problems with suspend and USB storage

From: Pavel Machek
Date: Fri May 16 2008 - 08:04:11 EST


> > I've been testing suspend/hibernate with various USB devices under
> > 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?
(cesky, pictures)
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at