linux-kernel - Re: [linux-pm] intermittent suspend problem again

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Date:	Sat, 14 Nov 2009 02:50:36 +0100
From:	Ferenc Wagner <wferi@...f.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm@...ts.linux-foundation.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	yakui.zhao@...el.com, LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [linux-pm] intermittent suspend problem again

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> On Friday 13 November 2009, Ferenc Wagner wrote:
>> "Rafael J. Wysocki" <rjw@...k.pl> writes:
>> 
>>> Yes, echo "core" to /sys/power/pm_test before executing s2disk.
>> 
>> It snapshots the system and returns, producing the same console output
>> as s2ram (is this the expected behaviour?)  I ran this several times in
>> a loop, and experienced no problems at all.  Maybe it depends on the
>> amount of memory used...  I saw a freeze saying "99% done" (ie. not
>> 100%), btw.
>
> The number is not always accurate because of rounding errors.  I think we can
> safely assume that it always happens after the entire image has been written.

Probably, "done" isn't output otherwise.

>> Are other pm_test values meaningful with s2disk?  Is this
>> handled explicitly in s2disk, or does simply the kernel act as if it was
>> resumed instead of providing the system image after SNAPSHOT_CREATE_IMAGE?
>
> The latter.

Ok, I found the code.  Are other pm_test values meaningful, or possibly
harmful?  I think I tried freezer, which resulted in a seemingly perfect
suspend, but the machine didn't try to resume afterwards, but booted
normally instead...

>>> On Wednesday 11 November 2009, Ferenc Wagner wrote:
>>>
>>>> I already did the test for STR (see
>>>> http://bugs.freedesktop.org/show_bug.cgi?id=22126#c3), but will redo
>>>> with the current kernel tonight.
>>>
>>> OK, thanks.
>> 
>> No change on this front, FWIW.  But rc7 is out now, I'll test again.
>
> Not sure if that's going to work, but yes please test it.

The KMS related STR freeze (evaluating the _PTS method) is still there.
I'm continuing testing s2disk with the platform method under rc7 (with
some instrumentation added).

Btw, s2ram -f works fine otherwise (no KMS), and my machine is not in
the whitelist.  I'm not sure whether the KMS problem disqualifies it
(shall I report it to suspend-devel?), but it can be identified by:
    sys_vendor   = "IBM"
    sys_product  = "1834S5G"
    sys_version  = "ThinkPad R50e"
    bios_version = "1WET90WW (2.10 )"
-- 
Thanks,
Feri.
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