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Message-ID: <1374764373.5374.42.camel@fourier>
Date: Thu, 25 Jul 2013 07:59:33 -0700
From: Kamal Mostafa <kamal@...onical.com>
To: Daniel Vetter <daniel@...ll.ch>
Cc: "Rafael J. Wysocki" <rjw@...k.pl>,
James Hogan <james@...anarts.com>,
Aaron Lu <aaron.lu@...el.com>, Kalle Valo <kvalo@...rom.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>,
Steven Newbury <steve@...wbury.org.uk>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Jörg Otte <jrg.otte@...il.com>,
Martin Steigerwald <Martin@...htvoll.de>,
Daniel Vetter <daniel.vetter@...ll.ch>,
intel-gfx <intel-gfx@...ts.freedesktop.org>,
Jani Nikula <jani.nikula@...ux.intel.com>
Subject: Re: Linux 3.11-rc2 (acpi backlight, revert)
On Thu, 2013-07-25 at 16:46 +0200, Daniel Vetter wrote:
> On Thu, Jul 25, 2013 at 07:43:17AM -0700, Kamal Mostafa wrote:
> > On Thu, 2013-07-25 at 15:00 +0200, Rafael J. Wysocki wrote:
> > > On Monday, July 22, 2013 09:54:21 PM 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 let's wait a while. Not because I think we'll fix the problem
> > > > > (hey, miracles might happen), but because I think it would be useful
> > > > > to couple the reverts with information about the particular machines
> > > > > that broke (and the people who reported it). So that when we
> > > > > inevitably try again, we can perhaps get some testing effort with
> > > > > those machines/people.
> > > > >
> > > > > It doesn't seem to be a show-stopped for a large number of people, so
> > > > > there's no huge hurry. 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.
> > >
> > > OK, time to revert I guess.
> > >
> > > James, Kamal, Steven, Jörg, Martin, Kalle, please check if the apppended patch
> > > fixes the backlight for you.
> >
> > Yes, this revert patch does re-enable backlight control for the affected
> > Dell XPS13 models.
>
> Are these the same models that neeed the special quirk to not write
> PCH_PWM_ENABLE? Or do they need both?
Hi Daniel-
Yes, these are the same models (Dell XPS13) that need the PCH_PWM_ENABLE
quirk, but that's not related to this ACPI problem...
All of the XPS13 models still need the PCH_PWM_ENABLE quirk which is now
present in mainline (e85843b "drm/i915: quirk no PCH_PWM_ENABLE for Dell
XPS13 backlight").
Separately from that, some of the XPS13 models were _also_ adversely
affected (as were some other machines) by the ACPI changes that are
about to be reverted.
-Kamal
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