linux-kernel - Re: Suspend to disk broken in latest 2.6.28-rc3

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Message-ID: <20081110094239.GA14204@atrey.karlin.mff.cuni.cz>
Date:	Mon, 10 Nov 2008 10:42:39 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Mathieu Chouquet-Stringer <mchouque@...e.fr>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org
Subject: Re: Suspend to disk broken in latest 2.6.28-rc3

Hi!

> I've just finished compiling a recent snapshot of rc3 (namely gfed4d59
> [1]) on a F9 distro (gcc 4.3.0 20080428) and suspend to disk doesn't
> work anymore.  My config is attached below [2].
> 
> It just freezes my laptop (an old Thinkpad T30) while it works with
> kernel version 2.6.26 (I've never tried 2.6.27).
> 
> I've tried playing with the pm_test facility, and while the "freezer"
> test works, the "devices" test fails like the real suspend...
> 
> When that happens, the console still works (ie I can switch VTs and
> type) but the whole system doesn't respond: I can't login for example...
> Guess the disk driver is already off at that point.
> 
> I don't have another computer to capture a serial trace so I guess I'm
> going to try to bisect it (which is going to take while on this slow
> computer).  If I reconfigure my syslog could I get the output of the
> suspend process on the screen (for some reason I used to get it during
> suspend but now I only get it during resume)?
> 
> Any ideas or pointers to fix this appreciated...

Trying with minimum drivers is likely to help here, and should be
easier than bisect. Boot with init=/bin/bash, then try "devices" >
pm_dest and disk > state...

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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