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[Dayle Riddoch <launchpad@xxxxxxxxxx>]

kernel-fixed-upstream
I installed and booted 3.14.0-031400rc7-generic #201403162235 SMP Mon Mar 17 02:36:19 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux without the acpi_backlight=vendor kernel parameter and both the hotkeys and the brightness applet are working correctly.

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https://bugs.launchpad.net/bugs/1296208

Title:
  Backlight controls not working on HP Elitebook 850 G1

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Backlight control does not work, but there are entries in /sys/class/backlight.
  This is a new laptop, I have not tried any previous kernel versions.
  Hotkeys do not change the brightness but do cause the OSD to pop up indicating what the brightness should be.
  Brightness applet does not work.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-19-generic 3.13.0-19.39
  ProcVersionSignature: Ubuntu 3.13.0-19.39-generic 3.13.6
  Uname: Linux 3.13.0-19-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  useradmin   3496 F.... pulseaudio
   /dev/snd/controlC0:  useradmin   3496 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Sat Mar 22 22:52:23 2014
  HibernationDevice: RESUME=UUID=a3e237f6-10cb-43a3-b9ed-ecfbc16de751
  InstallationDate: Installed on 2014-03-22 (1 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
  MachineType: Hewlett-Packard HP EliteBook 850 G1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-19-generic root=UUID=1209f2bc-bc3e-44ae-bf60-8c0bcb5cfb1e ro access=m2 quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-19-generic N/A
   linux-backports-modules-3.13.0-19-generic  N/A
   linux-firmware                             1.126
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/19/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L71 Ver. 01.08
  dmi.board.name: 198F
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 15.54
  dmi.chassis.asset.tag: CNU345C1WF
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL71Ver.01.08:bd02/19/2014:svnHewlett-Packard:pnHPEliteBook850G1:pvrA3009DD10303:rvnHewlett-Packard:rn198F:rvrKBCVersion15.54:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 850 G1
  dmi.product.version: A3009DD10303
  dmi.sys.vendor: Hewlett-Packard

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