From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jani Nikula <jani.nikula@linux.intel.com>
Subject: Re: Regression: Backlight not coming on after resume.
Date: Thu, 28 Feb 2013 17:33:56 +0200
Message-ID: <87lia8mp0b.fsf@intel.com>
References: <CAAMvbhG461HNV4-VaLDDwP5Z-FU4VttZO+ct2MogXSaQ8Cm6jg@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org>
Received: from mga11.intel.com (mga11.intel.com [192.55.52.93])
	by gabe.freedesktop.org (Postfix) with ESMTP id 18E12E5C89
	for <Intel-gfx@lists.freedesktop.org>;
	Thu, 28 Feb 2013 07:33:30 -0800 (PST)
In-Reply-To: <CAAMvbhG461HNV4-VaLDDwP5Z-FU4VttZO+ct2MogXSaQ8Cm6jg@mail.gmail.com>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/intel-gfx>,
	<mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
	<mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org
Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org
To: James Courtier-Dutton <james.dutton@gmail.com>, Intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

On Thu, 28 Feb 2013, James Courtier-Dutton <james.dutton@gmail.com> wrote:
> Bisect done on tree:
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> Worked on 3.7.
> Broken on 3.8
>
> Problem: "Backlight not coming on after resume."
> git finally bisected  for my Samsung Serial 7 Laptop.
> Bisecting: 0 revisions left to test after this (roughly 0 steps)
> [cf0a6584aa6d382f802f2c3cacac23ccbccde0cd] drm/i915: write backlight
> harder     <- This is the problem commit. Seems that fixing some
> machines breaks others, based on the existing comments on that patch.

The backlight haunts us again. Could you post the dmesg with
drm.debug=0xe module parameter, first running vanilla 3.8, and then with
the bad commit reverted, please?

Might not be a bad idea to file a bug on Product=DRI,
Component=DRM/Intel at https://bugs.freedesktop.org (see
https://01.org/linuxgraphics/documentation/how-report-bugs-0 for
details) and attach your bisect results and the dmesgs there.

Thanks,
Jani.