On 12/03/2013 06:10 PM, Guillaume Millet wrote: > Le 03/12/2013 05:25, Aaron Lu a écrit : >> 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-KernelTeamBugPolicies.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 Optimus >>> laptop (2 graphic cards). The use of the discrete Nvidia card is managed >>> 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#Screen_Brightness >>> 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 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 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 interface >> 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. Thanks, Aaron -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
