Message-ID: <497AF845.2000002@tuffmail.co.uk>
Date:	Sat, 24 Jan 2009 11:15:17 +0000
From:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	kernel-testers@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org, Pavel Machek <pavel@...e.cz>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: BISECTED: 2.6.29-rc2 regression: hibernation hang on eeepc-701

Rafael J. Wysocki wrote:
> On Friday 23 January 2009, Alan Jenkins wrote:
>   
>> Rafael J. Wysocki wrote:
>>     
>>> On Thursday 22 January 2009, Alan Jenkins wrote:
>>>   
>>>       
>>>> Rafael J. Wysocki wrote:
>>>>     
>>>>         
>>>>> On Thursday 22 January 2009, Alan Jenkins wrote:
>>>>>   
>>>>>       
>>>>>           
>>>>>> Alan Jenkins wrote:
>>>>>>     
>>>>>>         
>>>>>>             
>>>>>>> Hibernation hangs just after writing the image.  With s2disk I can see
>>>>>>> this from the console messages.  The same hang happens with kernel
>>>>>>> swsusp ('echo disk | sudo tee /sys/power/state'), and I can see that
>>>>>>> the image has been written from the HDD led.
>>>>>>>
>>>>>>> In either case, I can still hard-power-off and resume from hibernation.
>>>>>>>
>>>>>>> It doesn't hang if I use the shutdown method (either 'echo shutdown |
>>>>>>> sudo tee /sys/power/disk' or  's2disk -P "shutdown method=shutdown"').
>>>>>>>   
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>> I've bisected this to commit 571ff7584bb9e05fca0eb79752ae55a46faf3a98. 
>>>>>> It doesn't revert cleanly from RC2.
>>>>>>
>>>>>> I think it's distinct from the other two reported suspend regressions. 
>>>>>> I'm not using acpi-cpufreq, and the issue doesn't affect resume.
>>>>>>     
>>>>>>         
>>>>>>             
>>>>> It looks distinct.
>>>>>
>>>>> Do you suspend this box to RAM and does it work?
>>>>>   
>>>>>       
>>>>>           
>>>> Yes, I do use STR on it occasionally, and it still works in RC2.
>>>>
>>>>     
>>>>         
>>>>> Please retest with the appended patch applied.
>>>>>   
>>>>>       
>>>>>           
>>>> That fixes it.
>>>>     
>>>>         
>>> OK, it won't hurt to apply it.
>>>
>>> Still, the hardware or the BIOS in your box seems to be broken, or both, so I'd
>>> like to debug it a bit more if you don't mind.
>>>
>>> Can you please test the patch below instead of the previous one?
>>>   
>>>       
>> It hangs at the same point as the unpatched RC2.  As before, it doesn't
>> hang if I use "shutdown" instead of "platform".
>>
>> Going by sysfs, I have 4 PCI devices without a kernel driver.
>>
>> 8086:2592   Mobile 915 Express Graphics Controller
>> 8086:2792   Mobile 915 Express Graphics Controller (driven by X)
>> 8086:2448   82801 Mobile PCI Bridge
>> 8086:2641   82801FBM (ICH6M) LPC Interface Bridge
>>     
>
> The bridges shouldn't be affected, so I bet on the graphics.
>
> It seems that the BIOS doesn't expect it to be in D3 while entering S4,
> although it apparently doesn't mind it to be in D3 while entering S3.
>
> I blame the Asus BIOS writers. ;-)
>   

Wouldn't Windows normally put it into D3?  There are many reports of  
successful hibernation under Windows on this hardware.  The motivation 
being that S3 drains the battery in <24 hours.  (Fewer people hibernate 
on linux because you only have a 4G SSD, so a swap partition wastes a 
lot of space, and most installers can't set up swap files).

Also it sounds like it would break when the linux kernel mode setting 
driver is used.  I thought kernel mode setting was going to make suspend 
_more_ reliable :-).

So in the long term I think we either need to find a more specific root 
cause, or implement a PCI quirk for this quirky machine.

Thanks
Alan
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