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[madbiologist <1163418@xxxxxxxxxxxxxxxxxx>]

The patch you referred to is available in the upstream 3.11-rc5 kernel:

author Jani Nikula 2013-07-25
committer Daniel Vetter 2013-08-07
commit 3f577573cd5482a32f85bd131e52f7cb4b9ac518
tree 87c7eee0318624bbf90bf318646d0d5471bb41b2
parent 3eaba51cd399f5362a9fd9ebd5fb8b625b454271

drm/i915: do not disable backlight on vgaswitcheroo switch off

On muxed systems, the other vgaswitcheroo client may depend on i915 to
handle the backlight. We began switching off the backlight since

commit a261b246ebd552fd5d5a8ed84cc931bb821c427f
Author: Daniel Vetter
Date: Thu Jul 26 19:21:47 2012

    drm/i915: disable all crtcs at suspend time

breaking backlight on discreet graphics in (some) muxed systems.

Keep the backlight on when the state is changed through vgaswitcheroo.

Note: The alternative would be to add a quirk table to achieve the same
based on system identifiers, but AFAICS it would asymptotically approach
effectively the same as this patch as more IDs are added, but with the
maintenance burden of the quirk table.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=55311
Tested-by: Fede
Tested-by: Aximab
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=59785
Tested-by: sfievet
Signed-off-by: Jani Nikula
Cc: stable
Signed-off-by: Daniel Vetter

** Bug watch added: freedesktop.org Bugzilla #59785
   https://bugs.freedesktop.org/show_bug.cgi?id=59785

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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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