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    SubjectRe: [linux-pm] intermittent suspend problem again
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    On Thursday 29 October 2009, Ferenc Wagner wrote:
    > "Rafael J. Wysocki" <rjw@sisk.pl> writes:
    >
    > > On Thursday 29 October 2009, Ferenc Wagner wrote:
    > >> "Rafael J. Wysocki" <rjw@sisk.pl> writes:
    > >>
    > >>> On Wednesday 28 October 2009, Ferenc Wagner wrote:
    > >>>
    > >>>> Something similar to http://bugzilla.kernel.org/show_bug.cgi?id=13894
    > >>>> raised its ugly head again, please see my last comments on that bug.
    > >>>
    > >>> This very well may be a separete bug, so please file a new bugzilla report
    > >>> on this and mark it as a regression.
    > >>
    > >> Done.
    > >
    > > Which number is this?
    >
    > http://bugzilla.kernel.org/show_bug.cgi?id=14504

    Thanks.

    > Submitted containing the following paragraph only:

    That should be sufficient.

    > >>>> 2.6.32-rc5 feels particularly bad, with frequent failures to switch
    > >>>> off the machine after "S|" or freezes after "Snapshotting system".
    > >>>> The former does not cause much trouble in itself, as the machine can
    > >>>> be switched off and resumed all right, but the latter is nasty.
    > >>>> Suspend to RAM works all the time. The issue is not reproducible,
    > >>>> unfortunately, and the kernel change happened almost together with a
    > >>>> BIOS upgrade. Yesterday I switched back to 2.6.31 to see whether it
    > >>>> still works stably with the new BIOS. I'll report back my findings in
    > >>>> a couple of days.
    > >>>
    > >>> OK, thanks.
    > >>>
    > >>> Still, I'm really afraid we won't be able to debug it any further without a
    > >>> reproducible test case.
    > >>
    > >> I've got another, fully reproducible but nevertheless neglected ACPI
    > >> problem, already mentioned in #13894:
    > >> https://bugs.freedesktop.org/show_bug.cgi?id=22126.
    > >
    > > A side note: I'm totally unhappy with _kernel_ bugs being handled at
    > > bugs.freedesktop.org without a notice anywhere else. Even though they are
    > > related to the graphics, the kernel developers in general at least deserve the
    > > information that the bugs have been reported.
    > >
    > > In this particulare case, the bug is clearly related to ACPI and linux-acpi
    > > should have received a notification about it.
    >
    > When the ACPI relation became clear to me, I notified linux-acpi, see
    > http://thread.gmane.org/gmane.linux.acpi.devel/42172/focus=42230

    OK, thanks.

    > >> Well, it's probably far-fetched, but maybe the two are somehow related...
    > >
    > > Very well may be.
    > >
    > >> Can't you perhaps suggest a way forward there? Or some tricks to create a
    > >> reproducible test case here?
    > >
    > > Well, you can test if the problem is reproducible in the "shutdown" mode of
    > > hibernation.
    >
    > Ok, I'll go back to 2.6.32-rc5 for testing that. Does that make any
    > difference in the "Snapshotting system" phase?

    Yes, it does.

    > Freezes happen that time, too, before writing out the image.
    >
    > >> Btw. my gut feeling is that hibernation is getting slower with each
    > >> kernel release. I didn't measure it, and didn't even care about
    > >> comparable initial states... But could anything explain this, or is
    > >> it sheer impatience?
    > >
    > > Which part of it is getting slower? Saving the image, suspending
    > > devices or the entire hibernation overall?
    >
    > "Snapshotting system" before saving the image

    That may be a result of changing the way in which image memory is reserved.
    How much memory is there in your machine?

    > and saving the image as well. If s2disk didn't report funny huge negative
    > ratios all the time,

    Hmm. This looks like a bug in s2disk.

    > I'd probably have tried to correlate this with the number of
    > saved pages or similar... But anyway, this is a minor nit, it's still
    > far from being unbearable. If only it worked all the time!

    It should.

    Thanks,
    Rafael


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