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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1364148

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1364148

Title:
  Backlight turned off since upgrade to 3.13.0-35

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Since the upgrade to kernel 3.13.0-35 (from 3.13.0-34), the screen is very dark to the point it's unusable.
  Backlight seems completely turned off. Using the brightness keys doesn't help.
  It was working fine with 3.13.0-34.
  I found that the offending patch is "drm/radeon: set default bl level to something reasonable".
  I reverted this patch and recompiled 3.13.0-35, and it solved the problem.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  greg       1962 F.... pulseaudio
   /dev/snd/pcmC2D0p:   greg       1962 F...m pulseaudio
   /dev/snd/controlC1:  greg       1962 F.... pulseaudio
   /dev/snd/controlC0:  greg       1962 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=fa1d286a-7f50-4e1f-ae6c-9d48161e6c2d
  InstallationDate: Installed on 2010-07-03 (1521 days ago)
  InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
  MachineType: FUJITSU SIEMENS AMILO Xi 2550
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=UUID=7b8ed785-f136-4231-b6bd-5e175a9aef0b ro processor.max_cstate=1 radeon.dpm=1 quiet splash crashkernel=384M-:128M vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.5
  Tags:  trusty
  Uname: Linux 3.13.0-35-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-05-08 (116 days ago)
  UserGroups: adm admin bluetooth cdrom dialout lpadmin plugdev sambashare vboxusers wireshark
  _MarkForUpload: True
  dmi.bios.date: 09/30/2008
  dmi.bios.vendor: Phoenix
  dmi.bios.version: 1.15
  dmi.board.name: F44
  dmi.board.vendor: FUJITSU SIEMENS
  dmi.board.version: 00030D005503B103
  dmi.chassis.type: 10
  dmi.chassis.vendor: FUJITSU SIEMENS
  dmi.modalias: dmi:bvnPhoenix:bvr1.15:bd09/30/2008:svnFUJITSUSIEMENS:pnAMILOXi2550:pvr:rvnFUJITSUSIEMENS:rnF44:rvr00030D005503B103:cvnFUJITSUSIEMENS:ct10:cvr:
  dmi.product.name: AMILO Xi 2550
  dmi.sys.vendor: FUJITSU SIEMENS

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