One more specific information : in bare OpenBox X session, none of these keys have a visible effect handled by Ubuntu, except XF86WLAN.
Also, this laptop was sold with Windows, and there all function keys work, including the brightness keys. ## kernel-level showkey test I've tried https://wiki.ubuntu.com/Hotkeys/Troubleshooting but it seems outdated. No gconf-editor, used dconf-editor instead. Tree paths do not exist, /usr/share/doc/udev/README.keymap.txt does not exist. Anyway, following https://wiki.ubuntu.com/Hotkeys/Architecture I tested showkey. Fn-* combinations produced scancodes, except for the 3 malfunctioning brightness key combinations. ## acpi-level test Killing acpid would see it respawned immediately, so I moved the executable away for test. Suspend button yields acpi events, but not brightness buttons. $ sudo cat /proc/acpi/event button/sleep SLPB 00000080 0000000a battery BAT0 00000081 00000001 ac_adapter AC0 00000080 00000001 button/power PWRB 00000080 00000001 ## Now what ? This suggests that the problem should be fixed at kernel level, but it looks like kernel is never aware about those keypresses. https://wiki.ubuntu.com/Hotkeys/Troubleshooting says : > if there is neither an ACPI event nor an input event, this is probably also a kernel bug, though probably harder to diagnose (WMI, perhaps?) I'm clueless now. Thank you for any hint. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-input-evdev in Ubuntu. https://bugs.launchpad.net/bugs/1042359 Title: Partially broken brightness hotkey handling. Status in “xserver-xorg-input-evdev” package in Ubuntu: New Bug description: On an Asus n55sf, there is an issue with the handling of brightness adjust keys. ## Severity: consistent annoyance for the target human user Rationale: * On this laptop, the most natural way to set LCD brightness (hotkeys) *seems* to work at first. * But the user's choice is consistently overriden. * More precisely: it is overriden whenever, on batteries, there is a pause in keyboard/mouse activity (e.g. when the user reads text on-screen, or comes back to the laptop after a minute). * Caveat: the problem is *not* the laptop dimming the brightness to save power, this is expected behavior. The problem is, when user provides events again, brightness is not reverted to value set by hotkeys. ## Context * X session, it can be Unity or other (e.g. xfce), scenario is the same. * Bug noticeable when running on batteries (due to automatic brightness change on idle). ## Expected behavior * pressing Fn-F5 and Fn-F6 changes the brightness * pressing Fn-F5 and Fn-F6 show on-screen notification * on battery after 30 seconds without key/mouse event, backlight is dimmed. Then, pressing any key or moving mouse restores brigthness at the value set using keys ## Observed behavior * pressing Fn-F5 and Fn-F6 changes the brightness -> OK * pressing Fn-F5 and Fn-F6 *does not* show on-screen notification -> minor * on battery after 30 seconds without key/mouse event, backlight is dimmed. Then, pressing any key or moving mouse restores brigthness at the last value set using software (gnome-control-center, xbacklight, whatever, but *not* the brightness set using keys) -> bad ## Steps to reproduce * set backlight to 100% (using gnome-control-center or "xbacklight =100" (usage scenario : on AC, need bright display) * unplug AC power to run on battery * change brightness using Fn-F5, e.g. some value halfway (usage scenario : now on the move, need to save power) * count a little more than 30 seconds without touching keyboard/touchpad/mouse, see brightness reduces to minimum * press e.g. shift, or move mouse or touchpad * expected : brightness jumps to halfway (set using hotkeys) * observed : brightness jumps to maximum (set using software) ## Additional information * Other keys work: sound volume, wifi toggle, touchpad toggle, sound play/pause/previous/next/stop * Some working keys *do* display OSD feedback (at least volume up/down/mute, touchpad toggle, sound play/pause/previous/next/stop) * Some working keys do not display OSD feedback (wifi toggle, supend, LCD toggle, LCD/external display toggle) * On a different laptop, Asus X77VN, brightness keys do show on-screen notification with percentage bar, and the bug is never experienced. Laptop is different model but same brand and software, same packages, same system and user settings (Unity or xfce, same behaviour). ## Interpretation * Everything seems consistent with the interpretation that although brightness hotkeys do work, Ubuntu is never aware of that. So when Ubuntu changes the brightness, it can not do better than use the value set using software. ## Workaround * In gnome control center, uncheck "Dim screen to save power". A quick test shows that Ubuntu does not change brightness, so user preference set by hotkey is preserved. ## Other $ lsb_release -rd Description: Ubuntu 12.04.1 LTS Release: 12.04 ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: xorg 1:7.6+12ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-30.48-generic 3.2.27 Uname: Linux 3.2.0-30-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.0.1-0ubuntu12 Architecture: amd64 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,workarounds,scale,expo,ezoom] CompositorRunning: compiz Date: Mon Aug 27 19:24:46 2012 DistUpgraded: Fresh install DistroCodename: precise DistroVariant: ubuntu ExtraDebuggingInterest: Yes, GraphicsCard: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device [1043:2050] NVIDIA Corporation GF106 [GeForce GT 555M] [10de:1247] (rev ff) (prog-if ff) InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120419) MachineType: ASUSTeK Computer Inc. N55SF ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-30-generic root=UUID=31c3e78d-5937-43bd-b4b2-e14e52d2898c ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) XorgConf: Section "Device" Identifier "Default Device" Option "NoLogo" "True" EndSection dmi.bios.date: 08/29/2011 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: N55SF.207 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: N55SF dmi.board.vendor: ASUSTeK Computer Inc. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK Computer Inc. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN55SF.207:bd08/29/2011:svnASUSTeKComputerInc.:pnN55SF:pvr1.0:rvnASUSTeKComputerInc.:rnN55SF:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0: dmi.product.name: N55SF dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK Computer Inc. version.compiz: compiz 1:0.9.7.8-0ubuntu1.4 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.32-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.3+8.0.2-0ubuntu3.2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.3+8.0.2-0ubuntu3.2 version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.7 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4.1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-evdev/+bug/1042359/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
