Public bug reported:

Support to control screen back-light via hotkeys is broken. This previously 
worked under 12.04 precise.
Under 12.10 quantal, pressing Fn+F9  does not decrease backlight brightness.
Under 12.10 quantal, pressing Fn+F10 does not increase backlight brightness.

Backlight control is possible via appet (System Settings > Brightness
and Lock)

Following troubleshhoting guidelines at
https://wiki.ubuntu.com/Hotkeys/Troubleshooting, I believe that the hot-
key presses are not captured as neither input events nor ACPI Events.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-17-generic 3.5.0-17.28
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  leonard    2153 F.... pulseaudio
Date: Tue Oct 30 01:01:16 2012
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=7afe6b04-8cc4-420d-9c26-f63c28f60d93
InstallationDate: Installed on 2012-10-28 (0 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: Hewlett-Packard HP Compaq 6710b (KU234ES#ABV)
MarkForUpload: True
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-17-generic 
root=/dev/mapper/ubuntu-root ro quiet splash acpi_backlight=vendor
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-17-generic N/A
 linux-backports-modules-3.5.0-17-generic  N/A
 linux-firmware                            1.95
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/12/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68DDU Ver. F.18
dmi.board.name: 30C0
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 71.2E
dmi.chassis.asset.tag: CNU82119NQ
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68DDUVer.F.18:bd07/12/2011:svnHewlett-Packard:pnHPCompaq6710b(KU234ES#ABV):pvrF.18:rvnHewlett-Packard:rn30C0:rvrKBCVersion71.2E:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Compaq 6710b (KU234ES#ABV)
dmi.product.version: F.18
dmi.sys.vendor: Hewlett-Packard

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug quantal running-unity

** Description changed:

- Support to control screen back-light via hotkeys is broken. This previously 
worked under 12.04 precise. 
+ Support to control screen back-light via hotkeys is broken. This previously 
worked under 12.04 precise.
  Under 12.10 quantal, pressing Fn+F9  does not decrease backlight brightness.
  Under 12.10 quantal, pressing Fn+F10 does not increase backlight brightness.
  
  Backlight control is possible via appet (System Settings > Brightness
  and Lock)
  
  Following troubleshhoting guidelines at
  https://wiki.ubuntu.com/Hotkeys/Troubleshooting, I believe that the hot-
- key presses are not captures as either input events or ACPI Events.
+ key presses are not captured as neither input events nor ACPI Events.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-17-generic 3.5.0-17.28
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic x86_64
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  leonard    2153 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  leonard    2153 F.... pulseaudio
  Date: Tue Oct 30 01:01:16 2012
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=7afe6b04-8cc4-420d-9c26-f63c28f60d93
  InstallationDate: Installed on 2012-10-28 (0 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: Hewlett-Packard HP Compaq 6710b (KU234ES#ABV)
  MarkForUpload: True
  PccardctlIdent:
-  Socket 0:
-    no product info available
+  Socket 0:
+    no product info available
  PccardctlStatus:
-  Socket 0:
-    no card
+  Socket 0:
+    no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-17-generic 
root=/dev/mapper/ubuntu-root ro quiet splash acpi_backlight=vendor
  RelatedPackageVersions:
-  linux-restricted-modules-3.5.0-17-generic N/A
-  linux-backports-modules-3.5.0-17-generic  N/A
-  linux-firmware                            1.95
+  linux-restricted-modules-3.5.0-17-generic N/A
+  linux-backports-modules-3.5.0-17-generic  N/A
+  linux-firmware                            1.95
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/12/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68DDU Ver. F.18
  dmi.board.name: 30C0
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 71.2E
  dmi.chassis.asset.tag: CNU82119NQ
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68DDUVer.F.18:bd07/12/2011:svnHewlett-Packard:pnHPCompaq6710b(KU234ES#ABV):pvrF.18:rvnHewlett-Packard:rn30C0:rvrKBCVersion71.2E:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP Compaq 6710b (KU234ES#ABV)
  dmi.product.version: F.18
  dmi.sys.vendor: Hewlett-Packard

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https://bugs.launchpad.net/bugs/1072861

Title:
  No Backlight control via hotkey [12.10][HP-Compaq-6710b]

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