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[Bruno Beaufils <bruno@xxxxxxxxxxxx>]

BTW, I use EFI boot.

** Changed in: linux (Ubuntu)
       Status: Expired => In Progress

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https://bugs.launchpad.net/bugs/1190341

Title:
  Backlight stopped working after update of linux-image

Status in “linux” package in Ubuntu:
  In Progress

Bug description:
  I am using Ubuntu 13.04, fresh installation from scratch, on a
  MacBookPro10,1 (the one with Retina display). Two of my partition are
  encrypted (swap and /srv on which /home is bind mounted).

  Since some upgrade to linux-image-3.8.0-24 backlight control does not
  work anymore. I am stuck with 3.8.0-23 in order to get something kind
  of working (I have to go in sleep mode at least once in order to get
  backlight control available).

  I have the exact same symptoms than bug #1169376. The only difference
  is that no proposed fixes work at all. The last "almost working"
  kernel is 3.8.0-23.

  I even tried 3.9.0-030900 "upstream" kernel with no success.

  Sleep access is no more clean either. Sometime (more than a 1/3 of the
  cases) I am not able to resume the computer after having suspended it
  : sometime the computer is alive (I can ssh on it to shut it down
  since restarting lightdm does not resurrect the screen) but the screen
  is black, sometime it is not).

  Everything was working fine with the first installation of 13.04.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-23-generic 3.8.0-23.34
  ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11
  Uname: Linux 3.8.0-23-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  bruno      2696 F.... pulseaudio
   /dev/snd/controlC0:  bruno      2696 F.... pulseaudio
  CRDA:
   country FR:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (N/A, 20)
   	(5250 - 5330 @ 40), (N/A, 20), DFS
   	(5490 - 5710 @ 40), (N/A, 27), DFS
  Date: Wed Jun 12 21:02:22 2013
  HibernationDevice: RESUME=UUID=a703c1e3-dfc2-46af-9905-b21abb747366
  InstallationDate: Installed on 2013-02-06 (126 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64+mac (20121017.3)
  MachineType: Apple Inc. MacBookPro10,1
  MarkForUpload: True
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-23-generic root=UUID=5cafafc5-a506-4205-b6ba-e9fed6f9db99 ro quiet splash nomodeset vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-23-generic N/A
   linux-backports-modules-3.8.0-23-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-04-05 (68 days ago)
  dmi.bios.date: 08/08/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP101.88Z.00EE.B02.1208081132
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-C3EC7CD22292981F
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro10,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-C3EC7CD22292981F
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP101.88Z.00EE.B02.1208081132:bd08/08/2012:svnAppleInc.:pnMacBookPro10,1:pvr1.0:rvnAppleInc.:rnMac-C3EC7CD22292981F:rvrMacBookPro10,1:cvnAppleInc.:ct10:cvrMac-C3EC7CD22292981F:
  dmi.product.name: MacBookPro10,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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