Comment 0 for bug 1241745

Changing the screen brightness always used to work on my HP Elitebook 8560w -- both with the function keys and in the dialog "Brightness & Lock" in the system settings. The environment light sensor also used to work IIRC.

Since the update to 13.10, this stopped working. Methods I have tried for adapting the brightness are:

* Adding GRUB_CMDLINE_LINUX="acpi_backlight=vendor" to /etc/default/grub
* Adding GRUB_CMDLINE_LINUX=”acpi_osi="!Windows 2012" to /etc/default/grub

None of them worked.

Currently I am changing the brightness manually using xrandr --output LVDS-0 --brightness 0.9. However, AFAIK this does not really change the brightness, but only changes the contrast.

Workarounds would be much appreciated.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xorg 1:7.7+1ubuntu6
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 319.60 Wed Sep 25 14:28:26 PDT 2013
 GCC version: gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu8)
.tmp.unity.support.test.0:

ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Fri Oct 18 19:50:36 2013
DistUpgraded: 2013-10-17 17:20:47,580 DEBUG enabling apt cron job
DistroCodename: saucy
DistroVariant: ubuntu
DkmsStatus:
 nvidia-319-updates, 319.60, 3.11.0-12-generic, x86_64: installed
 nvidia-319-updates, 319.60, 3.8.0-31-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 NVIDIA Corporation GF108GLM [Quadro 1000M] [10de:0dfa] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:1631]
InstallationDate: Installed on 2013-01-06 (285 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
JockeyStatus:
 kmod:nvidia_319_updates - nvidia_319_updates (Proprietary, Enabled, Not in use)
 kmod:nvidia_304 - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
 kmod:nvidia_304_updates - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
 kmod:nvidia_319 - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
MachineType: Hewlett-Packard HP EliteBook 8560w
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=53f83a14-cacc-48fd-bb4b-354d69eb7f0e ro quiet splash "acpi_osi=!Windows 2012"
SourcePackage: xorg
UpgradeStatus: Upgraded to saucy on 2013-10-17 (1 days ago)
dmi.bios.date: 06/11/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68SVD Ver. F.27
dmi.board.name: 1631
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 01.3B
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68SVDVer.F.27:bd06/11/2012:svnHewlett-Packard:pnHPEliteBook8560w:pvrA0001D02:rvnHewlett-Packard:rn1631:rvrKBCVersion01.3B:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 8560w
dmi.product.version: A0001D02
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.46-1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Fri Oct 18 19:39:07 2013
xserver.configfile: default
xserver.errors:
 Failed to load /usr/lib/xorg/modules/libglamoregl.so: /usr/lib/xorg/modules/libglamoregl.so: undefined symbol: _glapi_tls_Context
 Failed to load module "glamoregl" (loader failed, 7)
 open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.14.3-3ubuntu2