linux-kernel - Re: [2.6.23] IBM X41 looses time after Suspend2Disk

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Date:	Fri, 2 Nov 2007 15:11:32 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Philipp Matthias Hahn <pmhahn@...an.lahn.de>
Cc:	Pavel Machek <pavel@....cz>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-pm@...ts.linux-foundation.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [2.6.23] IBM X41 looses time after Suspend2Disk

On Friday, 2 November 2007 14:33, Philipp Matthias Hahn wrote:
> Hello!
> 
> On Tue, Oct 30, 2007 at 10:08:01PM +0100, Pavel Machek wrote:
> > > > On Monday, 29 October 2007 21:19, Philipp Matthias Hahn wrote:
> > > > > I have an IBM X41 tablet pc running 2.6.23 with the following problem:
> > > > > Suspend2Ram work fine, but when I do a Suspend2Disk (echo disk >
> > > > > /sys/power/state), the notebook hangs showing the following lines:
> > > ...
> > > > >         Suspending console(s)
> > > > > 
> > > > > When I repeatedly press some keys or move the TrackPoint, the SwSusp
> > > > > continues and the notebook powers off.
> > > > > On reboot, the notebook resumes but hangs showing the following screen:
> > > ...
> > > > >         Suspending console(s)
> > > > > 
> > > > > Generating interrupts by pressing keys or moving the TrackPoints makes
> > > > > the resume continue. But after that, the notebook looses time, xterms
> > > > > don't get updated until I press a key, the beeper beeps until I press a
> > > > > key, etc.
> ...
> > > On Mon, Oct 29, 2007 at 10:24:14PM +0100, Pavel Machek wrote:
> > > > Yep, I seen that before. Try "nohz=off".
> > > 
> > > Okay, that seems to solve the "timer loosing time after resume" problem.
> > > 
> > > 
> > > But I still need to press some keys on suspend (7-12 key presses and
> > > releases) to unhang it. On resume not key presses are needed any
> > > more.
> > 
> > So it fixed resume but not suspend? strange. Try highres=off, too. And
> > maybe irqpoll?
> 
> highres=off did the trick. Thank you.
> 
> Does somebody want more data to debug this further?

Please create a bugzilla entry at http://bugzilla.kernel.org for this bug
(against "Power Management"->"Hibernation/Suspend") and put a summary of your
findings in there.  Also, please add my address to the bug's CC list.

Thanks,
Rafael
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