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[Daniel Dadap <ddadap@xxxxxxxxxx>]

Not to my knowledge: that changelog entry refers to adding an additional
interface via the NV-CONTROL API to the existing backlight
functionality. The problem is that the existing backlight functionality
is now broken on some laptops, so it doesn't make a difference whether
it's exposed through a new API or not.

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https://bugs.launchpad.net/bugs/1241745

Title:
  [regression] Changing the screen brightness does not work anymore in
  319.xx

Status in “linux” package in Ubuntu:
  Confirmed
Status in “nvidia-graphics-drivers-319” package in Ubuntu:
  Triaged

Bug description:
  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 that didn't work 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

  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.

  WORKAROUND: Use nvidia-graphics-drivers-304.

  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

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