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[Gregory Lardiere <gregory_lardiere@xxxxxxxx>]

The bug is not fixed in upstream kernel 3.17-rc3.
I have tested the kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.17-rc3-utopic/


** Tags added: kernel-bug-exists-upstream kernel-bug-exists-
upstream-3.17-rc3

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

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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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