** Description changed:

  The brightness system setting page does not effect the display
  brigthness and does not dispaly the currnet brightness.
  
  To reproduce:
  
  1. Set brightness to 50 using (as root):
  echo 50 > /sys/class/backlight/psb-bl/brightness
  
  2. Open System Settings > Brightness and Lock
  The slider display 100% (the last set value) instead of 50%
  
  3. Modify the slider
  The screen brightness does not change
- --- 
+ 
+ Further testing show that the brightness slider read and write
+ /sys/class/backlight/acpi_video0/brightness instead of
+ /sys/class/backlight/psb-bl/brightness.
+ 
+ ---
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: i386
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  nirs       2057 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  nirs       2057 F.... pulseaudio
  DistroRelease: Ubuntu 12.10
  HibernationDevice: RESUME=UUID=4cebec9a-7504-469c-8677-d25304edfd40
  InstallationDate: Installed on 2012-06-08 (267 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 
(20120423)
  MachineType: ASUSTeK COMPUTER INC. X101CH
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 psbfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-26-generic 
root=UUID=8a182610-1789-4b8d-b2e3-18f776104030 ro 
crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.5.0-26.40-generic 3.5.7.6
  RelatedPackageVersions:
-  linux-restricted-modules-3.5.0-26-generic N/A
-  linux-backports-modules-3.5.0-26-generic  N/A
-  linux-firmware                            1.95
+  linux-restricted-modules-3.5.0-26-generic N/A
+  linux-backports-modules-3.5.0-26-generic  N/A
+  linux-firmware                            1.95
  Tags:  quantal
  Uname: Linux 3.5.0-26-generic i686
  UpgradeStatus: Upgraded to quantal on 2013-02-22 (7 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 01/06/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X101CH.0501
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X101CH
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: x.xx
  dmi.chassis.asset.tag: 0x00000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: x.x
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrX101CH.0501:bd01/06/2012:svnASUSTeKCOMPUTERINC.:pnX101CH:pvrx.x:rvnASUSTeKCOMPUTERINC.:rnX101CH:rvrx.xx:cvnASUSTeKCOMPUTERINC.:ct10:cvrx.x:
  dmi.product.name: X101CH
  dmi.product.version: x.x
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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https://bugs.launchpad.net/bugs/1140581

Title:
  Brightness system settings do not work on Asus Eee PC X101CH

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