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[Bug 1550905] Re: [MacBookAir7, 1] Backlight control broken. Won't turn on after suspend.


Luke picciau, thank you for reporting this and helping make Ubuntu

In order to allow additional upstream developers to examine the issue, at your earliest convenience, could you please test the latest upstream kernel available from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D ? Please keep in mind the following:
1) The one to test is at the very top line at the top of the page (not the daily folder).
2) The release names are irrelevant.
3) The folder time stamps aren't indicative of when the kernel actually was released upstream.
4) Install instructions are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds .

If testing on your main install would be inconvenient, one may:
1) Install Ubuntu to a different partition and then test this there.
2) Backup, or clone the primary install.

If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:

Where X, and Y are the first two numbers of the kernel version, and Z is
the release candidate number if it exists.

If the mainline kernel does not fix the issue, please add the following tags:

Please note, an error to install the kernel does not fit the criteria of

Also, you don't need to apport-collect further unless specifically
requested to do so.

Once testing of the latest upstream kernel is complete, please mark this
report Status Confirmed. Please let us know your results.

Thank you for your understanding.

** Tags added: wily

** Changed in: linux (Ubuntu)
   Importance: High => Medium

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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  [MacBookAir7,1] Backlight control broken. Won't turn on after suspend.

Status in linux package in Ubuntu:

Bug description:
  The backlight on the MacBookAir7,1 can't be controlled, changing the
  brightness setting has no effect on the actual screen brightness. If
  you close the lid and the screen turns off it won't turn back on
  again, the keyboard lights turn on and you can see the lcd is on if
  you hold it to the light but the backlight won't turn back on.

  Tested on Ubuntu 16.04 but it also affects 15.10

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-8-generic 4.4.0-8.23 [modified: boot/vmlinuz-4.4.0-8-generic]
  ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2
  Uname: Linux 4.4.0-8-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
   /dev/snd/controlC1:  qwertie    1445 F.... pulseaudio
   /dev/snd/controlC0:  qwertie    1445 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Feb 28 21:32:12 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=57c0320e-dc88-4126-9554-7d5e81efd9ca
  InstallationDate: Installed on 2016-02-28 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160228)
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 05ac:0290 Apple, Inc.
   Bus 001 Device 006: ID 05ac:828f Apple, Inc.
   Bus 001 Device 002: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Apple Inc. MacBookAir7,1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-8-generic.efi.signed root=UUID=1db7d07c-799d-46d8-95d4-7f86fca35114 ro quiet splash vt.handoff=7
   linux-restricted-modules-4.4.0-8-generic N/A
   linux-backports-modules-4.4.0-8-generic  N/A
   linux-firmware                           1.156
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/02/2015
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA71.88Z.0166.B08.1509021746
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-9F18E312C5C2BF0B
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookAir7,1
  dmi.chassis.asset.tag: Chassis Board Asset Tag#
  dmi.chassis.type: 9
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-9F18E312C5C2BF0B
  dmi.modalias: dmi:bvnAppleInc.:bvrMBA71.88Z.0166.B08.1509021746:bd09/02/2015:svnAppleInc.:pnMacBookAir7,1:pvr1.0:rvnAppleInc.:rnMac-9F18E312C5C2BF0B:rvrMacBookAir7,1:cvnAppleInc.:ct9:cvrMac-9F18E312C5C2BF0B:
  dmi.product.name: MacBookAir7,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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