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[Ben Harris <bjh21@xxxxxxxxxxx>]

Reported upstream: http://article.gmane.org/gmane.linux.acpi.devel/72409

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https://bugs.launchpad.net/bugs/1397699

Title:
  [Dell Latitude 2110] Clicking brightness key once increments
  brightness as if pressed multiple times

Status in linux package in Ubuntu:
  Triaged

Bug description:
  According to <https://wiki.ubuntu.com/Hotkeys/Troubleshooting>, "If
  the events are reported by more than one input device then report a
  kernel bug (Ubuntu linux package) because it should only send the
  event on one device."  On my Latitude 2110, the brightness control
  keys (Fn+Up and Fn+Down) seem to appear through two different devices,
  /dev/input/event3 ("AT Translated Set 2 keyboard") and
  /dev/input/event4 ("Video Bus").  The keys also control the screen
  brightness, even in a text console.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-25-generic 3.16.0-25.33~14.04.2
  ProcVersionSignature: Ubuntu 3.16.0-25.33~14.04.2-generic 3.16.7
  Uname: Linux 3.16.0-25-generic i686
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: i386
  CurrentDesktop: Unity
  Date: Sun Nov 30 17:02:52 2014
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-motts-20100121-3
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2010-06-09 (1635 days ago)
  InstallationMedia: Ubuntu GNU/Linux 9.10 "Karmic" - Build i386 LIVE Binary 20100121-21:52
  SourcePackage: linux-lts-utopic
  UpgradeStatus: Upgraded to trusty on 2014-08-15 (106 days ago)
  --- 
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bjh21      2495 F.... pulseaudio
  CurrentDesktop: Unity
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-motts-20100121-3
  DistroRelease: Ubuntu 14.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=5f11e886-4c98-43d9-8d51-6ab48f0bff3f
  InstallationDate: Installed on 2010-06-09 (1636 days ago)
  InstallationMedia: Ubuntu GNU/Linux 9.10 "Karmic" - Build i386 LIVE Binary 20100121-21:52
  MachineType: Dell Inc. Latitude 2110
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic root=UUID=a7f66818-5a12-4932-922a-b05d92593b24 ro quiet splash crashkernel=384M-:128M crashkernel=384M-:128M vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-25.33~14.04.2-generic 3.16.7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-25-generic N/A
   linux-backports-modules-3.16.0-25-generic  N/A
   linux-firmware                             1.127.8
  StagingDrivers: rts5208
  Tags:  trusty staging
  Uname: Linux 3.16.0-25-generic i686
  UpgradeStatus: Upgraded to trusty on 2014-08-15 (108 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare wireshark
  WifiSyslog:
   Dec  1 21:57:47 sole kernel: [  713.837172] init: systemd-logind main process (504) killed by TERM signal
   Dec  1 21:57:58 sole kernel: [  724.781339] systemd-udevd[5391]: starting version 204
  _MarkForUpload: True
  dmi.bios.date: 03/09/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.name: 0N61H4
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd03/09/2010:svnDellInc.:pnLatitude2110:pvr:rvnDellInc.:rn0N61H4:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude 2110
  dmi.sys.vendor: Dell Inc.

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