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[Chris Cowan <agentme49@xxxxxxxxx>]

I've just tested 4.3-wily (4.3.0-040300-generic #201511020949) in Ubuntu
15.10 and I still see this issue.

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https://bugs.launchpad.net/bugs/1471634

Title:
  After suspend/resume, screen brightness can only be switched between 0
  and 100%

Status in linux package in Ubuntu:
  Expired

Bug description:
  I have the same issue as described in
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1197482. I have a
  macbook running Ubuntu 15.04, and if I suspend and then unsuspend,
  then my screen turns off when I set the brightness to to below 85%ish
  (4 presses of the brightness down key from full), and it's at full
  brightness when it's anywhere above that. Brightness controls work
  perfectly fine after booting before I ever suspend.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-21-generic 3.19.0-21.21
  ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
  Uname: Linux 3.19.0-21-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  chris      1861 F.... pulseaudio
   /dev/snd/controlC0:  chris      1861 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Jul  5 19:46:00 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-06-08 (28 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Apple Inc. MacBookAir6,2
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-21-generic.efi.signed root=UUID=fa0b84b0-1cfd-4da2-963e-8fc448a0b636 ro rootflags=subvol=@ noprompt persistent quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-21-generic N/A
   linux-backports-modules-3.19.0-21-generic  N/A
   linux-firmware                             1.143.1
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/07/2015
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA61.88Z.0099.B18.1501071032
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-7DF21CB3ED6977E5
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookAir6,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-7DF21CB3ED6977E5
  dmi.modalias: dmi:bvnAppleInc.:bvrMBA61.88Z.0099.B18.1501071032:bd01/07/2015:svnAppleInc.:pnMacBookAir6,2:pvr1.0:rvnAppleInc.:rnMac-7DF21CB3ED6977E5:rvrMacBookAir6,2:cvnAppleInc.:ct10:cvrMac-7DF21CB3ED6977E5:
  dmi.product.name: MacBookAir6,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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