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

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Message-ID: <CAGf84QJyzDTjd3=XJBDANJgwh4mT5yxPLoCrsMRuq5ZA8XJkJg@mail.gmail.com>
Date:	Tue, 1 Apr 2014 22:28:29 +1030
From:	Kieran Clancy <clancy.kieran@...il.com>
To:	Nicolas Porcel <nicolasporcel06@...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.

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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