linux-kernel - Re: [REGRESSION 3.14-rc6] Samsung N150 lid does not "open" after suspend to RAM.

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Message-ID: <533AFF51.2070806@gmail.com>
Date:	Wed, 02 Apr 2014 02:02:57 +0800
From:	Nicolas Porcel <nicolasporcel06@...il.com>
To:	Kieran Clancy <clancy.kieran@...il.com>
CC:	"D. G. Jansen" <d.g.jansen@...il.com>,
	Stefan Biereigel <stefan@...reigel.de>,
	Juan Manuel Cabo <juanmanuel.cabo@...il.com>,
	Stefan Biereigel <security@...reigel-wb.de>,
	Lan Tianyu <lantianyu1986@...il.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r kernel org" <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	San Zamoyski <san@...snet.pl>,
	"D. Jansen" <dennis.jansen@....de>,
	Maurizio D'Addona <mauritiusdadd@...il.com>
Subject: Re: [REGRESSION 3.14-rc6] Samsung N150 lid does not "open" after
 suspend to RAM.

I managed to recompile the kernel. Here is what I see in the logs:
kernel: ACPI : EC: acpi_ec_clear: EC_SC 0x20
kernel: ACPI : EC: acpi_ec_clear: EC_SC 0x08
kernel: ACPI : EC: 1 stale EC events cleared

I hope this will help

Regards,

Nicolas Porcel

Le 01/04/2014 20:18, Nicolas Porcel a écrit :
> Sure, I understand that you need to test it, that's why I am asking. I 
> don't want an untested patch to be included in the kernel either. We 
> also have to make sure that the patch fix the regression for all the 
> affected Samsung laptops.
>
> For the EC_SC code, I am using the first version of the patch without 
> the pr_info line, so I need to recompile the kernel. I'll let you know 
> as soon as it's done.
>
> Best regards,
>
> Nicolas Porcel
>
> On 01/04/2014 19:58, Kieran Clancy wrote:
>> On Tue, Apr 1, 2014 at 10:06 PM, Nicolas Porcel
>> <nicolasporcel06@...il.com> wrote:
>>> Do you have any idea of how much time will it take to merge it to the
>>> mainline ?
>> Apologies for the breakage. The key here is that we want a patch which
>> works 100% on all Samsung systems. If we rush a fix for this
>> regression, we may risk breaking things on other systems.
>>
>> Fortunately, the work-around in the case of this regression is very
>> simple (just repeat whatever event was ignored the first time, be it
>> lid open, ac plug, etc) compared to the bug which the original patch
>> fixed (which had no real workaround and caused near-permanent
>> malfunction).
>>
>> This is why I am asking people with Samsung systems to test the patch
>> (with the debug output I added in the kernel bugzilla attachment) and
>> confirm that it is working. I am also asking them to report EC_SC data
>> because we may be able to create a more targeted patch with this
>> information.
>>
>> Speaking of which, can you please let me know the EC_SC bytes you see
>> when you test it on your system, and if it is always the same?
>>
>> Once I hear back from users on a range of Samsung systems, I will
>> submit a patch. It should have enough time to land before 3.15. I will
>> also ask for it to be included in other stable branches.
>>
>> Kind regards,
>> Kieran
>

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