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[Bug 1340257] [NEW] brightness keys are not working.

 

Public bug reported:

I am using Dell xps-l501x and i recently upgraded my ubuntu to 14.04.
when i press f5, the brightness increases and when i press f5 to decrease, it reaches maximum. 
In the touch panel which has 3 buttons, the middle button performs the action which was supposed to be the function of f4 !!
please help me debug this problem as i am new to the ubuntu world.
Thank you :)

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-32-generic 3.13.0-32.56
ProcVersionSignature: Ubuntu 3.13.0-32.56-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  pruthvi    2464 F.... pulseaudio
CurrentDesktop: Unity
Date: Thu Jul 10 20:35:13 2014
InstallationDate: Installed on 2014-02-21 (138 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Dell Inc. XPS L501X
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=0bd76ea8-c534-46c2-b398-603109807bee ro GRUB_CMDLINE_LINUX_DEFAULT=quiet splash acpi_backlight=vendor vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-32-generic N/A
 linux-backports-modules-3.13.0-32-generic  N/A
 linux-firmware                             1.127.4
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-07-08 (1 days ago)
dmi.bios.date: 03/29/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.vendor: Dell Inc.
dmi.board.version: A07
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A07
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd03/29/2011:svnDellInc.:pnXPSL501X:pvrA07:rvnDellInc.:rn:rvrA07:cvnDellInc.:ct8:cvrA07:
dmi.product.name: XPS L501X
dmi.product.version: A07
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug package-from-proposed trusty

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https://bugs.launchpad.net/bugs/1340257

Title:
  brightness keys are not working.

Status in “linux” package in Ubuntu:
  New

Bug description:
  I am using Dell xps-l501x and i recently upgraded my ubuntu to 14.04.
  when i press f5, the brightness increases and when i press f5 to decrease, it reaches maximum. 
  In the touch panel which has 3 buttons, the middle button performs the action which was supposed to be the function of f4 !!
  please help me debug this problem as i am new to the ubuntu world.
  Thank you :)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.56
  ProcVersionSignature: Ubuntu 3.13.0-32.56-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  pruthvi    2464 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Jul 10 20:35:13 2014
  InstallationDate: Installed on 2014-02-21 (138 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Dell Inc. XPS L501X
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=0bd76ea8-c534-46c2-b398-603109807bee ro GRUB_CMDLINE_LINUX_DEFAULT=quiet splash acpi_backlight=vendor vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.4
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-07-08 (1 days ago)
  dmi.bios.date: 03/29/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A07
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A07
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd03/29/2011:svnDellInc.:pnXPSL501X:pvrA07:rvnDellInc.:rn:rvrA07:cvnDellInc.:ct8:cvrA07:
  dmi.product.name: XPS L501X
  dmi.product.version: A07
  dmi.sys.vendor: Dell Inc.

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