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Subject: Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online
 calls to hotplugged cpu")]
To: =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= <ville.syrjala@linux.intel.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>
References: <20160511101920.GZ4329@intel.com> <57332171.8070403@linutronix.de>
 <20160511122116.GA4329@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, linux-arch@vger.kernel.org,
        Rik van Riel <riel@redhat.com>, "Srivatsa S. Bhat" <srivatsa@mit.edu>,
        Peter Zijlstra <peterz@infradead.org>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Rusty Russell <rusty@rustcorp.com.au>,
        Steven Rostedt <rostedt@goodmis.org>, Oleg Nesterov <oleg@redhat.com>,
        Tejun Heo <tj@kernel.org>, Andrew Morton <akpm@linux-foundation.org>,
        Paul McKenney <paulmck@linux.vnet.ibm.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Paul Turner <pjt@google.com>, linux-kernel@vger.kernel.org,
        rui.zhang@intel.com, len.brown@intel.com,
        Linux PM <linux-pm@vger.kernel.org>
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Organization: Intel Technology Poland Sp. z o. o., KRS 101882, ul. Slowackiego
 173, 80-298 Gdansk
Message-ID: <5733354F.6080703@intel.com>
Date: Wed, 11 May 2016 15:36:15 +0200
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On 5/11/2016 2:21 PM, Ville Syrjälä wrote:
> On Wed, May 11, 2016 at 02:11:29PM +0200, Sebastian Andrzej Siewior wrote:
>> On 05/11/2016 12:19 PM, Ville Syrjälä wrote:
>>> Hi,
>> Hi,
>>
>>> I have a Lenovo Ideapad S10-3t machine here (Atom N450, 1 core, 2 HT)
>>> which fails to resume from S3 on 4.6-rc releases. I bisected it down to
>>>
>>> commit 1cf4f629d9d246519a1e76c021806f2a51ddba4d
>>> Author: Thomas Gleixner <tglx@linutronix.de>
>>> Date:   Fri Feb 26 18:43:39 2016 +0000
>>>
>>>      cpu/hotplug: Move online calls to hotplugged cpu
>>>
>>> Unfortunately that won't revert cleanly, and neither does the merge
>>> commit, so I was unable to see if that is the only problematic commit
>>> in 4.6.
>>>
>>> Any ideas?
>> do you have a backtrace or anything or is it just not working and you
>> end up with a blank screen?
> Yeah can't get anything from the machine at that point. netconsole
> didn't help either, and no serial on this machine. And IIRC I've
> tried ramoops on this thing in the past but unfortunately the memory
> got cleared on reboot.
>

Please try

# echo processors > /sys/power/pm_test

and then suspend (it should simulate a suspend, wait for approx. 5 sec 
and then resume, see
Documentation/power/basic_pm_debugging.txt for details).  See if that 
works or if you can get any
traces etc.

Thanks,
Rafael