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[Marco Trevisan (Treviño) <mail@xxxxxxxxx>]

An issue similar to this happens to me on suspend/resume... A workaround
is shown on bug #955046.

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https://bugs.launchpad.net/bugs/1163418

Title:
  Backlight is off when switching to discrete AMD GPU using
  vga_switcheroo and can't be turned on

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I have a MUXed hybrid graphics notebook with Intel Ironlake / AMD
  HD5650m GPUs and since upgrading to Ubuntu 13.04 (from 12.10) I have
  been having problems with vga_switcheroo.

  As stated in bug #1162526 I can't switch to the discrete GPU as I
  could on 12.10. Using the workaround posted by Vangel Ajanovski in
  askubuntu (http://askubuntu.com/questions/142506/hybrid-graphics-on-
  ubuntu-12-04-switching-to-discrete) I can switch to the discrete
  graphics, but when I do the laptop backlight turns off and I can't
  turn it on by any method I tried. It does work with an external HDMI
  display.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-15.25-generic 3.8.4
  Uname: Linux 3.8.0-15-generic x86_64
  NonfreeKernelModules: wl
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDmesg:
   [   63.473963] systemd-logind[2294]: New seat seat0.
   [   63.474063] systemd-logind[2294]: Failed to save seat data for seat0: No such file or directory
   [   64.482886] hda-intel 0000:01:00.1: Disabling via VGA-switcheroo
   [   64.600077] hda-intel 0000:01:00.1: Cannot lock devices!
   [   64.600083] radeon: switched off
  Date: Tue Apr  2 13:06:45 2013
  DistUpgraded: Fresh install
  DistroCodename: raring
  DistroVariant: ubuntu
  DkmsStatus: bcmwl, 6.20.155.1+bdcom, 3.8.0-15-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1436]
   Advanced Micro Devices [AMD] nee ATI Madison [Radeon HD 5000M Series] [1002:68c1] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2013-03-30 (2 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130328)
  MachineType: Hewlett-Packard HP ENVY 14 Notebook PC
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-15-generic root=UUID=67db7fed-d0f3-4c33-9a58-eb3860cfc7be ro quiet splash acpi_osi=Linux fbcon=map:0 vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/01/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.26
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 1436
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 59.24
  dmi.chassis.asset.tag: CNU03538DZ
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnHewlett-Packard:bvrF.26:bd12/01/2011:svnHewlett-Packard:pnHPENVY14NotebookPC:pvr0492100000241910000620000:rvnHewlett-Packard:rn1436:rvr59.24:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP ENVY 14 Notebook PC
  dmi.product.version: 0492100000241910000620000
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.9~daily13.03.29-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.43-0ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.3-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.3-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.5-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.7-0ubuntu1
  xserver.bootTime: Tue Apr  2 13:03:38 2013
  xserver.configfile: default
  xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.13.3-0ubuntu4
  xserver.video_driver: intel

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