Date:	Sun, 15 Apr 2007 09:38:20 +0200
From:	Tobias Diedrich <ranma+kernel@...edrich.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Adrian Bunk <bunk@...sta.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	pavel@...e.cz, linux-pm@...ts.osdl.org,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: Re: Linux 2.6.21-rc6

Rafael J. Wysocki wrote:
> On Saturday, 14 April 2007 23:35, Tobias Diedrich wrote:
> > Rafael J. Wysocki wrote:
> > > On Saturday, 14 April 2007 21:56, Tobias Diedrich wrote:
> > > > Rafael J. Wysocki wrote:
> > > > > On Saturday, 14 April 2007 15:00, Adrian Bunk wrote:
> > > > > > On Sat, Apr 14, 2007 at 02:31:54PM +0200, Tobias Diedrich wrote:
> > > > > > > Tobias Diedrich wrote:
> > > > > > > > > ed746e3b18f4df18afa3763155972c5835f284c5 is first bad commit
> > > > > > > > > commit ed746e3b18f4df18afa3763155972c5835f284c5
> > > > > > > > > Author: Rafael J. Wysocki <rjw@...k.pl>
> > > > > > > > > Date:   Sat Feb 10 01:43:32 2007 -0800
> > > > > > > > > 
> > > > > > > > >     [PATCH] swsusp: Change code ordering in disk.c
> > > > > > > > >     
> > > > > > > > >     Change the ordering of code in kernel/power/disk.c so that device_suspend() is
> > > > > > > > >     called before disable_nonboot_cpus() and platform_finish() is called after
> > > > > > > > >     enable_nonboot_cpus() and before device_resume(), as indicated by the recent
> > > > > > > > >     discussion on Linux-PM (cf.
> > > > > > > > >     http://lists.osdl.org/pipermail/linux-pm/2006-November/004164.html).
> > > > > > > > >     
> > > > > > > > >     The changes here only affect the built-in swsusp.
> > > > > > > > >     
> > > > > > > > >     [alexey.y.starikovskiy@...ux.intel.com: fix LED blinking during image load]
> > > > > > > > >     Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > > > > > > > >     Acked-by: Pavel Machek <pavel@....cz>
> > > > > > > > >     Cc: Greg KH <greg@...ah.com>
> > > > > > > > >     Cc: Nigel Cunningham <nigel@...pend2.net>
> > > > > > > > >     Cc: Patrick Mochel <mochel@...italimplant.org>
> > > > > > > > >     Cc: Alexey Starikovskiy <alexey.y.starikovskiy@...ux.intel.com>
> > > > > > > > >     Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> > > > > > > > >     Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> > > > > > > > > 
> > > > > > > > > :040000 040000 7eca5b3a8f9606bc4f2ff41192ec8c9d4ca90d18 8313b674e1d1bdf6849350af06d28a89b3bb3054 M      kernel
> > > > > > > > > 
> > > > > > > > > 
> > > > > > > > > Now, the remaining test is to try reverting this commit from -rc6. :)
> > > > > > > > 
> > > > > > > > Doesn't apply cleanly against -rc6, but fixes the problem when
> > > > > > > > reverted from -rc1.
> > > > > > > 
> > > > > > > Now, this was already reported in
> > > > > > > http://lkml.org/lkml/2007/3/16/126
> > > > > > > and I even flagged that message in my local folder, but apparently forgot
> > > > > > > to follow up on it... *sigh*
> > > > > > 
> > > > > > Unless I misunderstood something, all of the problems Maxim described in 
> > > > > > this email are fixed for him in -rc6.
> > > > > > 
> > > > > > But it's quite possible that you are running into a different issue 
> > > > > > exposed by this commit.
> > > > > 
> > > > > Yes, it's likely.
> > > > > 
> > > > > Tobias, I'm unable to reproduce the problem with your .config, but my hardware
> > > > > is certainly different.  Which suspend mode do you use?  If that's "platform",
> > > > > can you try to use "shutdown" or "reboot" and see if that helps?
> > > > 
> > > > Sure.
> > > > shutdown/reboot works fine, only platform is broken.
> > > 
> > > Thanks.
> > > 
> > > Now, I suspect the problem is somehow related to the hardware, so it would help
> > > a lot if we could identify the piece of hardware (or driver) involved.
> > > 
> > > AFAICT, your system is a non-SMP one, so we can rule out
> > > disable/enable_nonboot_cpus().  To confirm that the problem is related to
> > > platform_finish(), can you please apply the appended debug patch and
> > > see if the suspend in the 'platform' mode works with it?
> > 
> > Yes, it's a Asus M2N-SLI-Deluxe Mainboard with a Athlon64 3200+
> > single core CPU.
> > 
> > > Also, would that be feasible for you to use 'shutdown' as a workaround in case
> > > the source of the problem is difficult to find and/or fix?
> > 
> > I guess so, but the below patch fixes the problem. :)
> 
> Well, I thought it would, but it also would break some other people's systems.
> That's the _real_ problem.  Let's see if we can learn more.
> 
> Can you please revert it for now, apply the appended one and try to
> suspend/resume twice in the 'platform' mode (it may or may not work)?

Ok. The patch doesn't apply cleanly to 2.6.21-rc6:
|patching file kernel/power/disk.c
|Hunk #1 FAILED at 267.
|Hunk #2 succeeded at 265 (offset -23 lines).
|1 out of 2 hunks FAILED -- saving rejects to file
|kernel/power/disk.c.rej

wiggle helps, seems the first part of Hunk #1 is already applied in
2.6.21-rc6.
With CONFIG_PM_DEBUG=y and CONFIG_DISABLE_CONSOLE_SUSPEND=y I see
that the second suspend hangs at "i8042 i8042: EARLY resume".
This is kinda interesting because I'm normally using a USB keyboard
and sure enough, if I hook up a normal keyboard and disable USB
legacy support in the BIOS, then suspend to disk works multiple
times. I'd still rather like to use my USB keyboard though. ;)

-- 
Tobias						PGP: http://9ac7e0bc.uguu.de
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