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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