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

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Message-Id: <200805152204.15828.rjw@sisk.pl>
Date:	Thu, 15 May 2008 22:04:15 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Bill Nottingham <notting@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Pavel Machek <pavel@....cz>
Subject: Re: Problems with suspend and USB storage

On Thursday, 15 of May 2008, Bill Nottingham wrote:
> Rafael J. Wysocki (rjw@...k.pl) said: 
> > Well, the problem is that USB storage devices are disconnected during suspend
> > and hibernation and connected once again during resume.  Then, however, we
> > are not able to tell whether the device in the slot is the same that was in
> > there before the system was put into the sleep state.
> 
> 1) If they're disconnected, how come they work as a hibernate device? Or
>    are they disconnected twice?

They are disconnected right after the image has been loaded, so the resuming
hibernated kernel sees them as disconnected.

> 2) Isn't USB persist supposed to work around this?

That has been changing recently.  Please follow the Alan's advice to debug this
problem.

Thanks,
Rafael
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