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[Jeroen van Aart <debianbugs@xxxxxxxxx>]

This problem has not been solved yet it appears. I can confirm it is not
working on a Dell Latitude E5440 with Ubuntu 12.04 LTS, kernel
3.11.0-24-generic. The FN-F8 key is still not working correctly. I get
similar key scan codes as JeffH posted:

I pressed FN-F8 twice here, and then FN-Arrow up (brightness)

# acpi_listen -c 1
^[p
^[p
^@video LCD 00000086 00000000

Here I pressed FN-Arrow up (brightness) first and then FN-F8

# showkey
kb mode was UNICODE
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]

press any key (program terminates 10s after last keypress)...
keycode  28 release
keycode 225 press
keycode 225 release
keycode 125 press
keycode  25 press
keycode  25 release
keycode 125 release

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https://bugs.launchpad.net/bugs/722377

Title:
  [Dell Latitude E6400] Switch display Fn+F8 not working

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The Dell E6400 has a hardware button Fn+F8 that, on windows, switches
  between the internal and the externally connected HP f2105 monitor.

  What did i expect to happen is when pressing the button, like windows
  the display would switch to the external monitor. What happened
  instead is that when pressing this button in ubuntu nothing happens.

  ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 2/2
     Subdevice #0: subdevice #0
     Subdevice #1: subdevice #1
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  work       1726 F.... pulseaudio
   /dev/snd/pcmC0D0p:   work       1726 F...m pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf6adc000 irq 47'
     Mixer name	: 'Intel Cantiga HDMI'
     Components	: 'HDA:111d76b2,10280233,00100302 HDA:80862802,80860101,00100000'
     Controls      : 24
     Simple ctrls  : 15
  DistroRelease: Ubuntu 10.10
  HibernationDevice: RESUME=UUID=c44d4678-3197-4d15-bcc8-b1404aa9eca6
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta amd64 (20100901.1)
  MachineType: Dell Inc. Latitude E6400
  Package: linux (not installed)
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-28-generic root=UUID=011a04a8-aa8b-48dc-aa89-d52c7a32af85 ro quiet splash
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.35-28.50-generic 2.6.35.11
  Regression: No
  RelatedPackageVersions: linux-firmware 1.38.6
  Reproducible: Yes
  Tags: maverick kernel-uncat needs-upstream-testing
  Uname: Linux 2.6.35-28-generic x86_64
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 02/16/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A28
  dmi.board.name: 0W620R
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA28:bd02/16/2011:svnDellInc.:pnLatitudeE6400:pvr:rvnDellInc.:rn0W620R:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude E6400
  dmi.sys.vendor: Dell Inc.

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