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[alex <alex@xxxxxxxxx>]

I changed to EFI without reinstalling before, that didn't fix it.

After updating to the newest kernel it works now.

Linux mango 3.8.0-30-generic #44-Ubuntu SMP Thu Aug 22 20:52:24 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/1163720

Title:
  Brightness control broken on XPS13 with 3.8.0-16 and 3.8.0-22

Status in The Linux Kernel:
  Incomplete
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Raring:
  Fix Released

Bug description:
  Since 3.8.0-16, the brightness control doesn’t work anymore.
  The popup is displayed, so the shortcut keys do work correctly, but it has no effect on the actual brightness of the screen.

  Switching back to 3.8.0-15 solves the issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-16-generic 3.8.0-16.26
  ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
  Uname: Linux 3.8.0-16-generic x86_64
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  coucouf    1837 F.... pulseaudio
  Date: Wed Apr  3 08:29:58 2013
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-precise-amd64-20120703-2
  HibernationDevice: RESUME=UUID=e49e9eae-f16f-45bb-ad2c-b6da5c0c6f6d
  InstallationDate: Installed on 2013-03-23 (10 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20120703-15:08
  MachineType: Dell Inc. Dell System XPS L322X
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-16-generic root=UUID=3f6858e1-d8f5-44c4-b8e9-5ab8b9639ba7 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-16-generic N/A
   linux-backports-modules-3.8.0-16-generic  N/A
   linux-firmware                            1.104
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-04-02 (0 days ago)
  dmi.bios.date: 01/22/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0PJHXN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd01/22/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L322X
  dmi.sys.vendor: Dell Inc.

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