A similar bug report upstream:
https://bugs.freedesktop.org/show_bug.cgi?id=21266

@N8N
This is an upstream issue. If this problem still persists in latest Ubuntu 
release, suggest you to file a new bug report to upstream bugzilla by following 
the instructions at http://www.freedesktop.org/wiki/Software/xorg.

** Bug watch added: freedesktop.org Bugzilla #21266
   https://bugs.freedesktop.org/show_bug.cgi?id=21266

** Changed in: xorg-server (Ubuntu)
     Assignee: Ming Lei (tom-leiming) => (unassigned)

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https://bugs.launchpad.net/bugs/830063

Title:
  caps lock works across all keyboards but LED does not

Status in “xorg-server” package in Ubuntu:
  Confirmed

Bug description:
  Am using an external keyboard on a laptop (Dell Studio 1555) and have
  noticed that on any external keyboard if I press Caps Lock on the
  laptop's own keyboard that the LED will not light on the external
  keyboard, although anything that I type on that keyboard will be
  capitalized.  this was not a huge problem but I also recently got my
  hands on a Noppoo Choc Pro keyboard which apparently reports to the PC
  as several different keyboard controllers to achieve NKRO over USB and
  on that keyboard the Caps Lock LED does not function at all.  I did
  verify that it functions 100% correctly in Windows 7, so it does not
  appear to be a problem with the keyboard, rather, I suspect that the
  Caps Lock key and the Caps Lock LED are reporting on two different
  virtual keyboard controllers.  If I use the Noppoo keyboard as a PS/2
  keyboard and then connect it to the PC through a Belkin active PS/2 to
  USB adapter, the Caps Lock LED functions correctly.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-33-generic 2.6.32-33.72
  Regression: No
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-33.72-generic 2.6.32.41+drm33.18
  Uname: Linux 2.6.32-33-generic x86_64
  NonfreeKernelModules: fglrx
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  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:  n8n        1810 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfc500000 irq 22'
     Mixer name : 'IDT 92HD73C1X5'
     Components : 'HDA:111d7675,102802be,00100103'
     Controls      : 16
     Simple ctrls  : 10
  Card1.Amixer.info:
   Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfc010000 irq 17'
     Mixer name : 'ATI R6xx HDMI'
     Components : 'HDA:1002aa01,00aa0100,00100100'
     Controls      : 4
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Sat Aug 20 09:35:23 2011
  HibernationDevice: RESUME=UUID=bf04d4db-1758-4e01-bd08-76ee7c9835a6
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  MachineType: Dell Inc. Studio 1555
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-33-generic 
root=UUID=83f7f03f-e1d7-4ed6-903f-66d670664964 ro quiet splash
  ProcEnviron:
   LANG=en_US.utf8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.34.7
  SourcePackage: linux
  dmi.bios.date: 12/28/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0C234M
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A09
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A09
  dmi.modalias: 
dmi:bvnDellInc.:bvrA09:bd12/28/2009:svnDellInc.:pnStudio1555:pvrA09:rvnDellInc.:rn0C234M:rvrA09:cvnDellInc.:ct8:cvrA09:
  dmi.product.name: Studio 1555
  dmi.product.version: A09
  dmi.sys.vendor: Dell Inc.

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