From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aaron Lu Subject: Re: [PATCH v2] acpi-video: Add a parameter to not register the backlight sysfs interface Date: Thu, 11 Jun 2015 09:43:15 +0800 Message-ID: <20150611014315.GA26277@aaronlu.sh.intel.com> References: <1433838745-8857-1-git-send-email-hdegoede@redhat.com> <20150609091042.GA1280@aaronlu.sh.intel.com> <557760A5.9000404@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mga01.intel.com ([192.55.52.88]:18420 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751806AbbFKBmJ (ORCPT ); Wed, 10 Jun 2015 21:42:09 -0400 Content-Disposition: inline In-Reply-To: <557760A5.9000404@redhat.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Hans de Goede Cc: "Rafael J. Wysocki" , Ben Skeggs , platform-driver-x86@vger.kernel.org, dri-devel@lists.freedesktop.org, Sylvain Pasche , linux-acpi@vger.kernel.org On Tue, Jun 09, 2015 at 11:54:45PM +0200, Hans de Goede wrote: > 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. Thanks. According to the discussion in the bugzilla place, it doesn't seem we have any other way to handle this at the moment. Acked-by: Aaron Lu Best wishes, Aaron