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

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Date:	Tue, 23 Jul 2013 11:46:29 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	James Hogan <james@...anarts.com>,
	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>
Subject: Re: Linux 3.11-rc2 (acpi backlight)

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.


Also FYI...

On Mon, 2013-07-22 at 00:08 +0100, James Hogan wrote:
> Note that acpi_video0 only worked because I was applying "[PATCH]
> drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13 backlight" [1], so
> strictly speaking mainline already didn't work.
>  [1] http://lkml.org/lkml/2013/7/19/748

That patch is now queued up in drm-intel/drm-intel-fixes, so should be
making its way to mainline soon.

 -Kamal


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