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[Bug 1092517] Re: [Samsung N220] Cannot control backlight using the keyboard keys on Ubuntu Server


** Tags removed: latest-bios-08ji
** Tags added: needs-full-computer-model

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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  [Samsung N220] Cannot control backlight using the keyboard keys on
  Ubuntu Server

Status in “linux” package in Ubuntu:

Bug description:
  The problem appears in console mode only and it is that the backlight
  cannot be controlled with the Fn keys. It can neither be adjusted nor
  turned off. The Samsung N220 netbook runs Ubuntu Server 12.04.1 LTS
  and has a sun readable PixelQi display.

  ls /sys/class/backlight :

  I have put acpi_backlight=vendor kernel parameter as setting acpi
  video backlight does not have any effect.

  WORKAROUND: echo 200 |sudo dd of=/sys/class/backlight/intel_backlight/brightness
  echo 4 |sudo dd of=/sys/class/backlight/samsung/brightness

  The above commands work differently though. The first one allows
  controlling in great ranges, while the second controls the backlight
  within some bounds.

  WORKAROUND: With the following kernel parameter the Fn keys function correctly:

  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.0.1-0ubuntu15.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info: Error: [Errno 2] No such file or directory
  Card0.Amixer.values: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 12.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=5222a4fe-9efb-4de0-823d-82a44027cb1f
  InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. N150/N210/N220
  MarkForUpload: True
  Package: linux (not installed)
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-29-generic root=UUID=a357370c-979e-45c4-954b-0d62b3dc9df5 ro acpi_backlight=vendor
  ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
   linux-restricted-modules-3.2.0-29-generic N/A
   linux-backports-modules-3.2.0-29-generic  N/A
   linux-firmware                            1.79.1
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  precise
  Uname: Linux 3.2.0-29-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 03/25/2010
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: 08JI.M073.20100325.JIP
  dmi.board.asset.tag: SAMSUNG
  dmi.board.name: N150/N210/N220
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr08JI.M073.20100325.JIP:bd03/25/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnN150/N210/N220:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnN150/N210/N220:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
  dmi.product.name: N150/N210/N220
  dmi.product.version: Not Applicable
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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