From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guillaume Millet Subject: Re: 8086:2a42 [Asus UL80VT] Backlight control does not work with Intel integrated card, but there are entries in /sys/class/backlight Date: Wed, 04 Dec 2013 18:12:00 +0100 Message-ID: <529F6260.1080100@crans.org> References: <529CBB15.7000904@crans.org> <529D5D36.3000101@intel.com> <529DAE1C.1060501@crans.org> <529E827A.7030803@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from redisdead.crans.org ([138.231.136.39]:45269 "EHLO redisdead.crans.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932766Ab3LDRMI (ORCPT ); Wed, 4 Dec 2013 12:12:08 -0500 In-Reply-To: <529E827A.7030803@intel.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Aaron Lu Cc: ACPI Devel Mailing List https://bugzilla.kernel.org/show_bug.cgi?id=3D66501 Le 04/12/2013 02:16, Aaron Lu a =C3=A9crit : > On 12/03/2013 06:10 PM, Guillaume Millet wrote: >> Le 03/12/2013 05:25, Aaron Lu a =C3=A9crit : >>> On 12/03/2013 12:53 AM, Guillaume Millet wrote: >>>> Hello, I report an issue, in attempting to follow the instructions= at >>>> https://wiki.ubuntu.com/Bugs/Upstream/kernel#KernelTeam.2BAC8-Kern= elTeamBugPolicies.Overview_on_Reporting_Bugs_Upstream >>>> >>>> [1.] 8086:2a42 [Asus UL80VT] Backlight control does not work with = Intel >>>> integrated card, but there are entries in /sys/class/backlight >>>> >>>> [2.] The screen brightness control has apparently never worked >>>> off-the-shelf on this laptop, Asus UL80VT-A1, which is an NVIDIA O= ptimus >>>> laptop (2 graphic cards). The use of the discrete Nvidia card is m= anaged >>>> by Bumblebee (https://wiki.ubuntu.com/Bumblebee). It used to work = with >>>> the workaround suggested at >>>> http://wiki.daviddarts.com/Ubuntu_Maverick_on_the_Asus_UL30VT#Scre= en_Brightness >>>> which modifies asus-brn-down.sh to use the "setpci" method. >>>> Hotkeys are detected, showkey -s returns 0xe0 0x4c 0xe0 0xcc for F= n+F5 >>>> and 0xe0 0x54 0xe0 0xd4 for Fn+F6. >>>> When the hotkeys are triggered, there is no brightness change but = the >>>> KDE notification pops up with 3 or 4 levels. >>>> >>>> [X.] Other notes >>>> $ ls /sys/class/backlight/ >>>> acpi_video0 acpi_video1 intel_backlight >>>> >>>> $ cat /sys/class/backlight/intel_backlight/max_brightness >>>> 2583660 >>>> >>>> $ cat /sys/class/backlight/intel_backlight/brightness >>>> 121584 >>> With v3.12, does the intel_backlight interface work? >>> You can verify this by echoing some value to the brightness file an= d see >>> if it has any effect. The value can be echoed is 0 - max_brightness= =2E Be >>> careful with very small values, it will black your screen. >>> >>> If it works, you can specify intel_backlight as the control interfa= ce >>> for X by creating a xorg.conf file like this: >>> $ cat /etc/Xorg/Xorg.conf >>> Section "Device" >>> Option "Backlight" "intel_backlight" >>> Identifier "Card0" >>> Driver "intel" >>> BusID "PCI:0:2:0" >>> EndSection >> >> The intel_backlight interface does work, by echoing a value between = 0 >> and 2583660. >> The control interface for X also works with that addition in >> /etc/X11/xorg.conf (Kubuntu). >> >> Wow, the issue was immediately solved by posting here. Thanks Aaron = Lu! >> After, (out of curiosity) what should be modified so that X >> automatically detect the correct control interface, in case of a new >> installation for example ? > > Please file a bug to https://bugzilla.kernel.org, choose > ACPI-Power/Video category. > > Please provide these information when filing the bug: > 1 attach dmesg. > 2 attach acpidump output. > 3 attach dmidecode output. > 4 of those backlight control interfaces, which works and which don't. > 5 attach /var/log/Xorg.0.log when you do not use the customized xorg.= conf, > I want to know which interface is picked up by X driver by default= =2E > > Thanks, > Aaron > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html