From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans de Goede Subject: Re: [PATCH v2] acpi-video: Add a parameter to not register the backlight sysfs interface Date: Tue, 09 Jun 2015 23:54:45 +0200 Message-ID: <557760A5.9000404@redhat.com> References: <1433838745-8857-1-git-send-email-hdegoede@redhat.com> <20150609091042.GA1280@aaronlu.sh.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150609091042.GA1280@aaronlu.sh.intel.com> Sender: platform-driver-x86-owner@vger.kernel.org To: Aaron Lu Cc: "Rafael J. Wysocki" , Ben Skeggs , platform-driver-x86@vger.kernel.org, dri-devel@lists.freedesktop.org, Sylvain Pasche , linux-acpi@vger.kernel.org List-Id: linux-acpi@vger.kernel.org Hi, On 06/09/2015 11:10 AM, Aaron Lu wrote: > On Tue, Jun 09, 2015 at 10:32:25AM +0200, Hans de Goede wrote: >> On some systems acpi-video backlight is broken in the sense that it cannot >> control the brightness of the backlight, but it must still be called on >> resume to power-up the backlight after resume. > > All the video module does on resume is a backlight set operation, it > can't control backlight but can turn on the screen on resume? Hmm... > > I'll ask Sylvain to attach acpidump, let's see if there is anything > special there. Ok, lets see what comes out of that. Note in the mean time Sylvain has attached his acpidump. Regards, Hans