** Description changed:

  Using the default ati open source driver hotkeys are not working, echo
  commands are not working but files exist in sys/class/backlight.
  
  I used acpi_backlight=vendor , legacy and also the
  video.use_bios_initial_backlight=0 with no effect.
  
  Reverse mainline kernel version bisecting revealed the fix landed in the
  transition from 3.6.11 raring to 3.7-rc1 quantal.
  
- 
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-21-generic 3.5.0-21.32
  ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
  Uname: Linux 3.5.0-21-generic x86_64
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  micdhack   1643 F.... pulseaudio
-  /dev/snd/controlC0:  micdhack   1643 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  mt 1643 F.... pulseaudio
+  /dev/snd/controlC0:  mt 1643 F.... pulseaudio
  Date: Wed Dec 26 13:40:51 2012
  HibernationDevice: RESUME=UUID=b9ded35c-c251-435b-898e-e2827835b63a
  InstallationDate: Installed on 2012-12-25 (0 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: Sony Corporation SVE1112M1EW
  MarkForUpload: True
  ProcEnviron:
-  TERM=xterm
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-21-generic.efi.signed 
root=UUID=ff2bb0f9-b45a-4e72-871e-9463d0ab0c66 ro quiet splash acpi_osi=Linux 
acpi_backlight=legacy vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-3.5.0-21-generic N/A
-  linux-backports-modules-3.5.0-21-generic  N/A
-  linux-firmware                            1.95
+  linux-restricted-modules-3.5.0-21-generic N/A
+  linux-backports-modules-3.5.0-21-generic  N/A
+  linux-firmware                            1.95
  SourcePackage: linux
  StagingDrivers: rts_pstor
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/22/2012
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: R0120D8
  dmi.board.asset.tag: N/A
  dmi.board.name: VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnInsydeCorp.:bvrR0120D8:bd08/22/2012:svnSonyCorporation:pnSVE1112M1EW:pvrC60B8NZ6:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: SVE1112M1EW
  dmi.product.version: C60B8NZ6
  dmi.sys.vendor: Sony Corporation

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https://bugs.launchpad.net/bugs/1093795

Title:
  Backlight does not work on sony vaio sve1112

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