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SubjectRe: Unreliable hibernation on Lenovo x230 (regression)
On Thu, 2 Apr 2015 17:28:05 +0200
Pavel Machek <pavel@ucw.cz> 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

I tried to disable CONFIG_CPU_IDLE and CONFIG_CPU_FREQ, however for some reason I could only disable CONFIG_CPU_FREQ.

The bug persisted.

Reverting the commit 84c91b7 on top of e67ee10 fixes the problem.

I created a copy of the bug report here: https://bugzilla.kernel.org/show_bug.cgi?id=96111

Cheers,
rhn


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