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[Damian Beltrami <849110@xxxxxxxxxxxxxxxxxx>]

I have the same problem on my Sony Vaio.  At some point, an update
caused backlighting to stop working.

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https://bugs.launchpad.net/bugs/849110

Title:
  Regression: keyboard backlight hotkeys no longer work

Status in “gnome-power-manager” package in Ubuntu:
  Confirmed

Bug description:
  They keyboard backlight control hotkeys on my Macbook Pro (3,1) no
  longer function properly in 11.10. This is a regression from 11.04,
  and I believe a regression from 11.10 beta 1.

  There are 3 keys on the keyboard:
  Keyboard backlight toggle
  Keyboard backlight down
  Keyboard backlight up

  In 11.04, the keyboard backlight up/down keys adjusted the keyboard
  backlight as expected, and the corresponding OSD notifications worked
  as well. The 'keyboard backlight off' never functioned properly.

  At some point after 11.10 beta 1, the keyboard backlight hotkeys
  stopped functioning properly. The keyboard backlight is no longer
  controllable using the hotkeys. Pressing any of the 3 hotkeys results
  in the 'full backlight' OSD being displayed, with no change to the
  actual keyboard backlight.

  I can still control the keyboard backlight manually from a command line. For example, to turn the keyboard backlight on to 100% then off:
  echo 255 | sudo tee -a  /sys/class/leds/smc\:\:kbd_backlight/brightness
  echo 0 | sudo tee -a  /sys/class/leds/smc\:\:kbd_backlight/brightness

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gnome-power-manager 3.1.90-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-11.17-generic 3.0.4
  Uname: Linux 3.0.0-11-generic x86_64
  ApportVersion: 1.22.1-0ubuntu2
  Architecture: amd64
  Date: Tue Sep 13 11:34:14 2011
  GnomeSessionIdleInhibited: No
  GnomeSessionInhibitors: None
  GnomeSessionSuspendInhibited: No
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta amd64 (20100901.1)
  MachineType: Apple Inc. MacBookPro3,1
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-11-generic root=UUID=4b3d81ed-fb5d-4946-97c0-ec537e1bfa3f ro quiet splash vt.handoff=7
  SourcePackage: gnome-power-manager
  UpgradeStatus: Upgraded to oneiric on 2011-09-02 (11 days ago)
  dmi.bios.date: 03/05/08
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP31.88Z.0070.B07.0803051658
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Mac-F4238BC8
  dmi.board.vendor: Apple Inc.
  dmi.board.version: PVT
  dmi.chassis.asset.tag: Asset Tag#
  dmi.chassis.type: 2
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F4238BC8
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP31.88Z.0070.B07.0803051658:bd03/05/08:svnAppleInc.:pnMacBookPro3,1:pvr1.0:rvnAppleInc.:rnMac-F4238BC8:rvrPVT:cvnAppleInc.:ct2:cvrMac-F4238BC8:
  dmi.product.name: MacBookPro3,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  gnome-power-bugreport: Error: [Errno 2] No such file or directory

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