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[Launchpad Bug Tracker <887776@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/887776

Title:
  [Dell Latitude E4200] Ambient Light sensor doesn't work

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  I have a problem with my system, i think it's a kernel issue because
  light sensor stop to respond after kernel load.

  For example, when i am in the GRUB menu, light sensor work correctly
  and i can enable and disable sensor with FN+left arrow, but when
  kernel starts to load, without any module loaded (i stop loading to an
  emergency shell, so i eliminate issues concerning modules or any other
  software, i.e. gnome-power-manager), light sensor stops to work.

  I test my pc with a CentOS 5.5 live (kernel 2.6.18) and it's OK, also
  in emergency shell, if i try with CentOS 6 (kernel version over
  2.6.30) the issue is present, so i think it's a kernel regression, but
  i'm not sure.

  My collegue with a Dell Latitude XT (it's an older series) has not the
  issue, its ambient light sensor works fine.

  with lsinput i identify the Dell Wky Hotkeys and if i check with
  /lib/udev/keymap -i input/event6 i read:

  scan code: 0x4B   key code: unknown

  So is this a problem related to dell_wmi?

  What can i do to identify the issue more precisely?

  Ubuntu version: 11.10
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alby       2047 F.... pulseaudio
  CRDA: Error: [Errno 2] File o directory non esistente
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf6adc000 irq 47'
     Mixer name	: 'Intel Cantiga HDMI'
     Components	: 'HDA:111d76b2,10280277,00100302 HDA:80862802,80860101,00100000'
     Controls      : 19
     Simple ctrls  : 11
  DistroRelease: Ubuntu 11.10
  HibernationDevice: RESUME=UUID=cb0b4561-895d-4949-8ea3-d84800d86cb7
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  MachineType: Dell Inc. Latitude E4200
  Package: linux (not installed)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-13-generic root=/dev/mapper/Debian-root ro quiet splash quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-13-generic N/A
   linux-backports-modules-3.0.0-13-generic  N/A
   linux-firmware                            1.60
  StagingDrivers: mei
  Tags:  oneiric staging
  Uname: Linux 3.0.0-13-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout disk libvirtd lpadmin plugdev sambashare
  dmi.bios.date: 08/17/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A18
  dmi.board.name: 0D516F
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA18:bd08/17/2010:svnDellInc.:pnLatitudeE4200:pvr:rvnDellInc.:rn0D516F:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude E4200
  dmi.sys.vendor: Dell Inc.

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