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[Bruno Beaufils <bruno@xxxxxxxxxxxx>]

Nothing  changes with any of the boot parameters you asked me to try,
separately.

I tried thoses parameters only with the current stable ubuntu kernel
(3.11.0-15-generic). I also tried, separately, to set i915.modeset=1
with no more luck.

The current boot parameters are these one :

quiet i915.lvds_channel_mode=2 i915.modeset=0 i915.lvds_use_ssc=0 splash
acpi_osi=

BTW, I use nvidia binary Xorg driver (nvidia-319-updates).

My only workaround to date is to boot with the old kernel (3.8.0-22.23),
put the laptop in sleep mode once, wake it up and then I got backlight
control working.

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

Title:
  [MacBookPro10,1] Backlight stopped working after update of linux-image
  with nvidia 313.30

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I am using Ubuntu 13.04, nvidia 313.30, 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). The last "almost working"
  kernel is 3.8.0-23. I even tried 3.9.0-030900 "upstream" kernel with
  no success. 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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