linux-kernel - Re: 2.6.25-rc7 : hibernation sometimes not resuming on Dell Latitude D630

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Date:	Thu, 3 Apr 2008 17:48:57 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Didier Raboud <didier@...oud.com>
Cc:	linux-kernel@...r.kernel.org, debian-kernel@...ts.debian.org
Subject: Re: 2.6.25-rc7 : hibernation sometimes not resuming on Dell Latitude D630

On Thursday, 3 of April 2008, Didier Raboud wrote:
> Le mercredi, 2 avril 2008 14.06:29 Didier Raboud, vous avez écrit :
> > Le mardi, 1 avril 2008 23.22:35 Rafael J. Wysocki, vous avez écrit :
> > > On Tuesday, 1 of April 2008, Didier Raboud wrote:
> > > > Le mardi, 1 avril 2008 23.11:15 Rafael J. Wysocki, vous avez écrit :
> > > > > (...)
> > > > > Can you please test the in-kernel hibernation, then?
> > > > >
> > > > > Rafael
> > > >
> > > > Hi,
> > > >
> > > > would like to. How ?
> > > >
> > > > # echo -n disk > /sys/power/state
> > >
> > > Yes, should work without the "-n", too.  Of course, you have to use the
> > > 'resume=' kernel command line argument for this to work.
> > >
> > > Perhaps increase the console log level before that.
> > >
> > > Thanks,
> > > Rafael
> >
> > Ok. I found a "better" way to do it : just uninstall uswsusp and let
> > kpowersave use hal to use suspend :-)
> >
> > Anyway, so far so good (with USB_SUSPEND not set), no hang. I will test
> > with USB_SUSPEND set and the incoming 2.6.25-rc8.
> >
> > Regards,
> >
> > Didier
> 
> So far so good too with "stock" Debian Kernel (2.7.25-rc7-amd64) with 
> USB_SUSPEND set. No hang.
> 
> The kernel suspend is less user-friendly than uswsusp though...
> 
> So I bet there is a bug in uswsusp's kernel part ?

It's almost the same as the in-kernel one, especially as far as the resume is
concerned.  The simplest explanation coming to mind is that the image is
somehow damaged in the uswsusp case.

You can use the uswsusp's checksumming to verify that, though.

Thanks,
Rafael
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