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[Bug 1309584] [NEW] Backlight does not work on intel driver after upgrade from 13.10 -> 14.04


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I am running on an HP EliteBook Folio 9470m which has an i915 video

After upgrading to 14.04, the backlight and brightness controls do not
work on the laptop screen.

$ sudo intel_backlight 
current backlight value: 4%

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
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
CurrentDesktop: Unity
Date: Fri Apr 18 08:02:05 2014
DistUpgraded: 2014-04-18 01:03:05,027 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus: openvswitch, 2.0.1+git20140120: added
ExtraDebuggingInterest: Yes, including running git bisection searches
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:18df]
InstallationDate: Installed on 2013-01-14 (459 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64+mac (20121017.3)
MachineType: Hewlett-Packard HP EliteBook Folio 9470m
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/ubuntu-root ro quiet splash "acpi_osi=!Windows 2012" vt.handoff=7
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to trusty on 2014-04-18 (0 days ago)
dmi.bios.date: 09/24/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68IBD Ver. F.30
dmi.board.name: 18DF
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 62.13
dmi.chassis.asset.tag: CNU2439PZT
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68IBDVer.F.30:bd09/24/2012:svnHewlett-Packard:pnHPEliteBookFolio9470m:pvrA1029D1103:rvnHewlett-Packard:rn18DF:rvrKBCVersion62.13:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook Folio 9470m
dmi.product.version: A1029D1103
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Fri Apr 18 01:04:29 2014
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
 product id                                5239 
 vendor                                     CMN
xserver.version: 2:1.15.1-0ubuntu2

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug compiz-0.9 trusty ubuntu
Backlight does not work on intel driver after upgrade from 13.10 -> 14.04
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