linux-kernel - Re: Linux 3.11-rc2 (acpi backlight)

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Date:	Wed, 24 Jul 2013 05:54:18 +0100
From:	Steven Newbury <steve@...wbury.org.uk>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Kamal Mostafa <kamal@...onical.com>,
	James Hogan <james@...anarts.com>,
	Martin Steigerwald <Martin@...htvoll.de>,
	Jörg Otte <jrg.otte@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: Linux 3.11-rc2 (acpi backlight)

On Wed, 2013-07-24 at 02:05 +0200, Rafael J. Wysocki wrote:
> On Tuesday, July 23, 2013 11:46:29 AM Kamal Mostafa wrote:
> > On Mon, 2013-07-22 at 21:54 +0200, Rafael J. Wysocki wrote:
> > > On Monday, July 22, 2013 11:11:54 AM Linus Torvalds wrote:
> > > > On Mon, Jul 22, 2013 at 6:02 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > > > >
> > > > > Linus, do you want me to send a pull request reverting 8c5bd7a and efaa14c?
> > > > 
> > > > Yes, but [...] I'd suggest doing the revert just in time for
> > > > rc3, but waiting until then to gather info about people who see
> > > > breakage.
> > > > 
> > > > Sound like a plan?
> > > 
> > > Yes, it does.
> > > 
> > > Rafael
> > 
> > 
> > Hi Rafael-
> > 
> > For your reference...
> > 
> > As James Hogan reported, those ACPI changes break backlight control on
> > the "Dell XPS13" Ivy Bridge models (the Sandy Bridge XPS13 model is not
> > affected).
> > 
> > I confirm that reverting 8c5bd7a and efaa14c fixes it again.
> 
> Thanks!
> 
> I'd like to collect some information on the systems having problems with those
> two commits (to see if they are similar somehow).
> 
> It seems that one common symptom is that brightness cannot be controlled
> through function keys.  Is that correct for all of you?  If so, did you try
> any other way to control brightness, like a GUI-based?
> 
> Also, can you all please send me (a) the output of dmidecode and (b) the
> contents of /proc/cpuinfo from your systems?
> 
> Rafael
> 
> 

Attached.


View attachment "cpuinfo.txt" of type "text/plain" (7664 bytes)

View attachment "dmi.txt" of type "text/plain" (12817 bytes)