From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aaron Lu 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 09:16:42 +0800 Message-ID: <529E827A.7030803@intel.com> References: <529CBB15.7000904@crans.org> <529D5D36.3000101@intel.com> <529DAE1C.1060501@crans.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mga02.intel.com ([134.134.136.20]:6128 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754129Ab3LDBQm (ORCPT ); Tue, 3 Dec 2013 20:16:42 -0500 In-Reply-To: <529DAE1C.1060501@crans.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Guillaume Millet Cc: ACPI Devel Mailing List 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-Kerne= lTeamBugPolicies.Overview_on_Reporting_Bugs_Upstream >>> >>> [1.] 8086:2a42 [Asus UL80VT] Backlight control does not work with I= ntel >>> 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 Op= timus >>> laptop (2 graphic cards). The use of the discrete Nvidia card is ma= naged >>> by Bumblebee (https://wiki.ubuntu.com/Bumblebee). It used to work w= ith >>> the workaround suggested at >>> http://wiki.daviddarts.com/Ubuntu_Maverick_on_the_Asus_UL30VT#Scree= n_Brightness =20 >>> which modifies asus-brn-down.sh to use the "setpci" method. >>> Hotkeys are detected, showkey -s returns 0xe0 0x4c 0xe0 0xcc for Fn= +F5 >>> and 0xe0 0x54 0xe0 0xd4 for Fn+F6. >>> When the hotkeys are triggered, there is no brightness change but t= he >>> 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 and= see >> if it has any effect. The value can be echoed is 0 - max_brightness.= Be >> careful with very small values, it will black your screen. >> >> If it works, you can specify intel_backlight as the control interfac= e >> 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 >=20 > The intel_backlight interface does work, by echoing a value between 0= =20 > and 2583660. > The control interface for X also works with that addition in=20 > /etc/X11/xorg.conf (Kubuntu). >=20 > Wow, the issue was immediately solved by posting here. Thanks Aaron L= u! > After, (out of curiosity) what should be modified so that X=20 > automatically detect the correct control interface, in case of a new=20 > 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.co= nf, I want to know which interface is picked up by X driver by default. 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