linux-kernel - Re: Resume hangs [was: mmotm 2010-12-02-16-34 uploaded]

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Message-ID: <4D4C468F.4080105@gmail.com>
Date:	Fri, 04 Feb 2011 19:33:51 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	"Rafael J. Wysocki" <rjw@...e.com>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: Resume hangs [was: mmotm 2010-12-02-16-34 uploaded]

On 01/31/2011 11:00 PM, Rafael J. Wysocki wrote:
> On Monday, January 31, 2011, Jiri Slaby wrote:
>> On 01/20/2011 10:02 PM, Rafael J. Wysocki wrote:
>>> On Thursday, January 20, 2011, Jiri Slaby wrote:
>>>> On 01/06/2011 03:18 PM, Jiri Slaby wrote:
>>>>> On 12/14/2010 11:22 PM, Rafael J. Wysocki wrote:
>>>>>> On Tuesday, December 14, 2010, Jiri Slaby wrote:
>>>>>>> On 12/13/2010 10:10 PM, Rafael J. Wysocki wrote:
>>>>>>>> On Monday, December 13, 2010, Jiri Slaby wrote:
>>>>>>>>> On 12/05/2010 02:08 PM, Rafael J. Wysocki wrote:
>>>>>>>>>> On Sunday, December 05, 2010, Jiri Slaby wrote:
>>>>>>>>>>> On 12/03/2010 01:34 AM, akpm@...ux-foundation.org wrote:
>>>>>>>>>>>> The mm-of-the-moment snapshot 2010-12-02-16-34 has been uploaded to
>>>>>>>>>>>
>>>>>>>>>>> Hi, this kernel regresses with respect to resume. It doesn't wake up,
>>>>>>>>>>> the screen is black with blinking cursor at position [1, 1].
>>>>>>>>>>> 2010-11-23-16-12 seemed to be OK. In this one it is 100% reproducible so
>>>>>>>>>>> far.
>>>>>>>>>>>
>>>>>>>>>>> I'm using pm-suspend, any ideas what to test before I start to find the
>>>>>>>>>>> reason on my own?
>>>>>>>>>>
>>>>>>>>>> Please try the pm_test tests for core, processors and devices, eg.:
>>>>>>>>>
>>>>>>>>> Hmm, I haven't seen the issues since then. So it had to be some kind of
>>>>>>>>> coincidence -- I see the issue occasionally for some time already. Now
>>>>>>>>> it triggered twice in a row after I updated the kernel.
>>>>>>>>
>>>>>>>> Hmm.  What hardware is that?
>>>>>>>
>>>>>>> What exactly do you want to know about it? It's some specific intel
>>>>>>> desktop machine, 3 years old, 2 intel cores, 6G of mem, 2 sata disks in
>>>>>>> raid, dvb-t usb receiver (af9015), usb keyboard and mouse.
>>>>>>
>>>>>> I'm seeing pretty much the same symptoms on quite different hardware, except
>>>>>> for one thing: USB keyboard and mouse.
>>>>>>
>>>>>> Have you checked if writing 0 to /sys/power/pm_async helps?
>>>>>
>>>>> It's very hard to reproduce (it happens once a week or two), so I can't
>>>>> say yet. As it happened yesterday again, going to test it from now on.
>>>>
>>>> Ok, I haven't seen the issue with 0 in /sys/power/pm_async for two weeks
>>>> now (I added it to boot.local). I would say it's related to that...
>>>
>>> In that case the next step would be to build the kernel with
>>> CONFIG_PM_ADVANCED_DEBUG set and try to switch the async flag for individual
>>> devices (it is located is /sys/devices/.../power/ for each device).
>>>
>>> For example, I wonder if it is sufficient to unset it for all USB devices.
>>
>> It seems to suffice... No hangs still. Should I enable pm_async back
>> again to confirm the issue is still present?
> 
> Yes, please, it would be good to know for sure.

Ok, confirmed right now :).

I disabled pm_async for USB again. What do you suggest next?

thanks,
-- 
js
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