Re: Unreliable hibernation on Lenovo x230 (regression)

[joeyli <jlee@suse.com>]

Hi, 

On Thu, Apr 02, 2015 at 05:28:05PM +0200, Pavel Machek wrote:
> On Wed 2015-04-01 21:47:43, rhn wrote:
> > Hello,
> > 
> > Between kernel 3.16 and 3.17, a regression has been introduced where the first hibernation after regular shutdown always fails to resume. Subsequent hibernations succeed.
> > 
> > The system is a Lenovo x230 with Intel i5, booting with EFI, with the hibernate partition located on a secondary SSD drive. Installed system is Fedora 20, hibernation and reboots were issued using the KDE shutdown dialog.
> > 
> > I have tracked the problem to first appear in the commit
> > e67ee10190e69332f929bdd6594a312363321a66	Merge branches 'pm-sleep', 'pm-cpufreq' and 'pm-cpuidle'
> > 
> > The problem itself manifests in dmesg as follows (system was first
> > restarted, then hibernated - this log is from the subsequent
> resume):
> 
> Ok, can you try to disable cpufreq and cpuidle, and then try if it
> reproduces?
> 
> At that point, this is the candidate:
> 
> commit e67ee10190e69332f929bdd6594a312363321a66
> Merge: 21c806d 84c91b7 39c8bba 372ba8c
> Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Date:   Mon Aug 11 23:19:48 2014 +0200
> 
>     Merge branches 'pm-sleep', 'pm-cpufreq' and 'pm-cpuidle'
> 
>     * pm-sleep:
>           PM / hibernate: avoid unsafe pages in e820 reserved regions
> 
> ...
> Alternatively, you can just try to revert
> 
> commit 84c91b7ae07c62cf6dee7fde3277f4be21331f85
> Author: Lee, Chun-Yi <joeyli.kernel@gmail.com>
> Date:   Mon Aug 4 23:23:21 2014 +0800
> 
>     PM / hibernate: avoid unsafe pages in e820 reserved regions
> 
>     When the machine doesn't well handle the e820 persistent when
>     hibernate
>         resuming, then it may cause page fault when writing image to
>     snapshot
>         buffer:
> 
> 
> ...
> 
> Thanks,
> 									Pavel

Before revert 84c91b7ae patch, please check does there have log similar as
following in dmesg when hibernate resume fail?

[   24.349777] PM: 0xab9bc000 in e820 nosave region: [mem 0xab9bc000-0xab9c2fff]

The address may different, by you should see "e820 nosave region" log. Otherwise
we got another problem.


Thanks a lot!
Joey Lee