From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aaron Lu Subject: Re: i915 backlight Date: Thu, 01 Aug 2013 09:13:35 +0800 Message-ID: <51F9B63F.7060509@intel.com> References: <20130731162252.GC4724@pd.tnic> <20130731163623.GD4724@pd.tnic> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20130731163623.GD4724@pd.tnic> Sender: linux-kernel-owner@vger.kernel.org To: Borislav Petkov Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, lkml , "Rafael J. Wysocki" List-Id: dri-devel@lists.freedesktop.org On 08/01/2013 12:36 AM, Borislav Petkov wrote: > On Wed, Jul 31, 2013 at 06:22:52PM +0200, Borislav Petkov wrote: >> Dudes, >> >> has anyone already reported this (happens on Linus of today + >> tip/master): > > Oh, one more thing: I can't control the backlight anymore on this x230 > with the Fn-Fx keys and this is most probably related to that recent > backlight revert story. If there is a new approach I can test, please > let me know. Can you please run acpi_listen and then press the Fn-Fx key, see if the events are correctly sent out? > > Btw, it worked before on this machine with "acpi_backlight=vendor" on > the cmdline. >>From the bug page: https://bugzilla.kernel.org/show_bug.cgi?id=51231#c80 I got the impression that both the acpi_video interface and the vendor interface thinkpad_screen are broken. So adding this cmdline here works suggests that either thinkpad_screen works or thinkpad vendor driver doesn't get loaded or doesn't create that interface for some reason. Alternatively, if the intel_backlight interface works(highly possible), you can use xorg.conf to specify the that backlight interface for X. Section "Device" Option "Backlight" "intel_backlight" Identifier "Card0" Driver "intel" BusID "PCI:0:2:0" EndSection Thanks, Aaron