[Expired for xorg (Ubuntu) because there has been no activity for 60
days.]

** Changed in: xorg (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1574243

Title:
  Unable to adjust screen backlight on login screen on Macbook Pro
  (early 2015)

Status in xorg package in Ubuntu:
  Expired

Bug description:
  
  1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> 
About Ubuntu

  Fresh install of 16.04.

  2) The version of the package you are using, via 'apt-cache policy
  pkgname' or by checking in Software Center

  Don't know. The guide to identify the package told me all login screen
  issues were "LightDM". ubuntu-bug told me that package was not
  installed.

  3) What you expected to happen

  To be able to adjust screen backlight brightness with the dedicated
  hardware buttons on the login screen, in order to be able log in. This
  works as expected whenever I'm logged in.

  4) What happened instead

  I had to log in from an almost black login screen with no backlight.

  I believe this bug was present in 15.10 as well.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2
  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: Sun Apr 24 13:58:00 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Broadwell-U Integrated Graphics [8086:162b] (rev 09) 
(prog-if 00 [VGA controller])
     Subsystem: Apple Inc. Broadwell-U Integrated Graphics [106b:013f]
  InstallationDate: Installed on 2016-04-24 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  MachineType: Apple Inc. MacBookPro12,1
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic.efi.signed 
root=UUID=dd7fd213-44e3-45de-afe3-efd8c5825c1e ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/11/2016
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP121.88Z.0167.B16.1602111810
  dmi.board.name: Mac-E43C1C25D4880AD6
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro12,1
  dmi.chassis.type: 9
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-E43C1C25D4880AD6
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMBP121.88Z.0167.B16.1602111810:bd02/11/2016:svnAppleInc.:pnMacBookPro12,1:pvr1.0:rvnAppleInc.:rnMac-E43C1C25D4880AD6:rvrMacBookPro12,1:cvnAppleInc.:ct9:cvrMac-E43C1C25D4880AD6:
  dmi.product.name: MacBookPro12,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Sun Apr 24 02:40:40 2016
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               41002 
   vendor                                     APP
  xserver.version: 2:1.18.3-1ubuntu2

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