linux-kernel - Re: [ibm-acpi-devel] suspend/hibernation regression between 2.6.19 and 2.6.20 w/ Thinkpad T41

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Date:	Wed, 8 Aug 2007 22:24:38 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Toralf Förster <toralf.foerster@....de>,
	ibm-acpi-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>
Subject: Re: [ibm-acpi-devel] suspend/hibernation regression between 2.6.19 and 2.6.20 w/ Thinkpad T41

On Wednesday, 8 August 2007 16:48, Henrique de Moraes Holschuh wrote:
> On Wed, 08 Aug 2007, Rafael J. Wysocki wrote:
> > > I wish we loaded the kernel just once, maybe from the boot loader.
> > 
> > Well, that's not so easy.  That will work for the bare image, but if we want it
> > to be compressed and/or encrypted, then the boot loader will need to
> > contain all of the necessary code.
> 
> Doing things right always have an associated cost, or we'd be doing it right
> since day one...
> 
> > I may be doable by using a special boot kernel with ACPI disabled and only
> > as many drivers as required to load the image, but that will make it more
> > difficult to set up and to recover from errors.
> 
> Better than the walking bomb we have now.  When waking from suspend-to-disk,
> we should not overwrite ANY non-kernel data which has ties to external
> systems (the hardware, the firmware).  Instead, we should re-init everything
> (re-init hardware to make sure we know in which state it is, re-init
> ourselves, to make sure we match the firmware and hardware state), as if we
> were booting a cold system in the first place.

Yes, we've already had an agreement about that on linux-pm, now the problem is
to implement it and not to break things in the process ...


-- 
"Premature optimization is the root of all evil." - Donald Knuth
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