From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhang Rui Subject: Re: no brightness with acpi video since 3.3 [was Re: Issues with the sony-platform module] Date: Tue, 19 Jun 2012 08:59:34 +0800 Message-ID: <1340067574.1682.5.camel@rui.sh.intel.com> References: <4FDA2051.3050108@babioch.de> <20120614203914.GA2645@kamineko.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20120614203914.GA2645@kamineko.org> Sender: platform-driver-x86-owner@vger.kernel.org To: Mattia Dongili Cc: Karol Babioch , platform-driver-x86@vger.kernel.org, ACPI Devel Mailing List List-Id: linux-acpi@vger.kernel.org On =E4=BA=94, 2012-06-15 at 05:39 +0900, Mattia Dongili wrote: > On Thu, Jun 14, 2012 at 07:33:05PM +0200, Karol Babioch wrote: > > Hi, > >=20 > > I'm a user of the Sony VAIO VPCS12C5E and as such have always strug= gled > > with the Linux support of my laptop basically forever. Until now I'= ve > > used the patch provided here [1], which worked quite well for some = time. > > However since kernel version 3.3 I couldn't change the brightness o= f my > > screen anymore. >=20 > This is not an issue with the platform driver but with the acpi video > driver. >=20 so ACPI video driver is used before 3.3 and it works? please try this patch https://bugzilla.kernel.org/attachment.cgi?id=3D73576 and boot without acpi_backlight=3Dvendor and see if it helps. thanks, rui > You can boot with acpi_backlight=3Dvendor and get brightness control = back > but the issue with acpi_video remains. >=20 > ... > > So, I've uploaded a dmesg log when loading the module with the debu= g > > option enabled and trying to change the brightness with the fn keys= here > > [2]. Maybe this is already enough to nail the issue down. Otherwise= just > > let me know what you would like to have. >=20 > please provide your laptop's DSDT table as well. >=20 > > [1] https://code.google.com/p/vaio-f11-linux/wiki/KernelSupport > > [2] http://pastebin.com/GRrtp024 >=20 > Thanks