linux-kernel - Re: [3/6] 2.6.21-rc4: known regressions

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Date:	Mon, 26 Mar 2007 06:05:09 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, pavel@...e.cz,
	linux-pm@...ts.osdl.org, gregkh@...e.de,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Jens Axboe <jens.axboe@...cle.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [3/6] 2.6.21-rc4: known regressions

On Mon, Mar 26, 2007 at 09:25:51AM +0800, Jeff Chua wrote:
> On 3/19/07, Adrian Bunk <bunk@...sta.de> wrote:
> 
> >Subject    : ThinkPad doesn't resume from suspend to RAM
> >References : http://lkml.org/lkml/2007/2/27/80
> >             http://lkml.org/lkml/2007/2/28/348
> >Submitter  : Jens Axboe <jens.axboe@...cle.com>
> >             Jeff Chua <jeff.chua.linux@...il.com>
> >Status     : unknown
> >
> >
> >Subject    : suspend to disk hangs
> >References : http://lkml.org/lkml/2007/3/6/142
> >Submitter  : Jeff Chua <jeff.chua.linux@...il.com>
> >Status     : unknown
> 
> The good news is on 2.6.21-rc5, suspend to disk, and resume from disk works.
> But, it only works with CONFIG_NO_HZ unset.

Thanks for this information.

> Setting CONFIG_NO_HZ will cause suspend to disk to hang just before
> saving memory to disk.

Thanks, noted.

> Resume from RAM (s2ram) still broke (tried with or without
> CONFIG_NO_HZ). Suspend to RAM seems ok, but upon resume, the screen
> will only display "inu" and only after pressing the power button will
> the system return to console. But "date" still doesn't advance.

This might be related to the following regression:

Subject    : first disk access after resume takes several minutes
             ('date' does not advance after resume from RAM, CONFIG_NO_HZ=n)
References : http://lkml.org/lkml/2007/3/8/117
             http://lkml.org/lkml/2007/3/25/20
Submitter  : Michael S. Tsirkin <mst@...lanox.co.il>
Handled-By : Thomas Gleixner <tglx@...utronix.de>
             Ingo Molnar <mingo@...e.hu>
Status     : problem is being debugged

> Thanks,
> Jeff.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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