linux-kernel - Re: Suspend-resume failure on Intel Eagle Lake Core2Duo

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Message-ID: <820f14ea-a9a0-52fd-6cae-8888bb47f93e@linux.intel.com>
Date:   Fri, 28 Jul 2017 15:34:03 +0300
From:   Martin Peres <martin.peres@...ux.intel.com>
To:     Tomi Sarvela <tomi.p.sarvela@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     jeffy.chen@...k-chips.com, linux-kernel@...r.kernel.org
Subject: Re: Suspend-resume failure on Intel Eagle Lake Core2Duo

On 27/07/17 10:36, Tomi Sarvela wrote:
> On 26/07/17 17:26, Thomas Gleixner wrote:
>> On Wed, 26 Jul 2017, Martin Peres wrote:
>>> On 25/07/17 10:01, Tomi Sarvela wrote:
>>>> On 24/07/17 19:37, Martin Peres wrote:
>>>>> On 24/07/17 19:35, Thomas Gleixner wrote:
>>>>>> On Mon, 24 Jul 2017, Martin Peres wrote:
>>>>>>> On 24/07/17 18:28, Thomas Gleixner wrote:
>>>>>>>> Output of 'cat /proc/interrupts' and a description what kind of
>>>>>>>> 'old' Intel
>>>>>>>> platform that is.
>>>>>>>
>>>>>>> Sorry, I should have repeated the name outside of just the 
>>>>>>> subject of
>>>>>>> the
>>>>>>> email. It is an Intel Eagle Lake Core2Duo.
>>>>>>
>>>>>> I hoped you would give me a little bit more details, but I Gurgled it
>>>>>> now. I try to find such a beast and look what's wrong there. If I 
>>>>>> can't
>>>>>> find one, I'll come back with some debug patches.
>>>>>
>>>>> Ha, sorry!
>>>>>
>>>>> Here is all the info I have:
>>>>>    - Hardware: HP Compaq 8000
>>>>>    - CPU: Eagle Lake Core2Duo E7500
>>>>
>>>> As mentioned, it's HP Compaq 8000 Elite, desktop tower in most basic
>>>> configuration: one SATA SSD, 4GB memory and so on. Most recent BIOS 
>>>> from
>>>> around 2012, no UEFI.
>>>>
>>>> If you have proposed fix for the issue, I'll be happy to test them.
>>>>
>>>> Best regards,
>>>
>>> Thanks for the information Tomi.
>>>
>>> Thomas, any update on this? Another user reported the problem:
>>
>> Not yet.
>>
>>> "I have the same thing on an old cheap laptop.
>>> model name      : Intel(R) Core(TM)2 CPU
>>> cpu family      : 6
>>> model           : 15
>>>
>>> Previously, this never happened on the kernel series 4.{10,11,12}.
>>> After reverted commit bf22ff45bed664 on 4.13-rc2, unfortunately it 
>>> still hangs
>>> when it wakes up.
>>
>> So reverting that commit does not help. Does it help on your machine?
> 
> Yes. Reverting it does not cause the machine to lock up on resume.
> 
> I haven't tested if the machine locks up later on, but at least it 
> survives couple of s/r cycles

FYI, the user who reported reverting the patch was not sufficient 
actually now says he was hit by a second bug which he found.

So, a revert is always possible.

Cheers,
Martin