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[Levi Bard <taktaktaktaktaktaktaktaktaktak@xxxxxxxxx>]

Missed comment #9. :-|
The workaround is still required in 14.04, using nvidia-337 from ppa:xorg-edgers.

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https://bugs.launchpad.net/bugs/1243897

Title:
  [MacBookPro10,1] brightness setting has no effect

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  After upgrade from 13.04 to 13.10, setting the screen brightness has
  no effect (either via the hotkeys, "Brightness & Lock" settings, or
  via /sys/devices/pnp0/00:07/backlight/gmux_backlight/brightness ).

  I'm using nvidia driver 319.32-0ubuntu7.
  I've tried Option "RegistryDwords" "EnableBrightnessControl=1" in xorg.conf as well as the kernel argument acpi_backlight=vendor .

  I have the following in /sys:
  $ find /sys -name brightness
  /sys/devices/pnp0/00:07/backlight/gmux_backlight/brightness
  /sys/devices/pci0000:00/0000:00:1c.0/0000:03:00.1/leds/mmc0::/brightness
  /sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness

  WORKAROUND: setpci -v -H1 -s 00:01.00 BRIDGE_CONTROL=0

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  NonfreeKernelModules: wl nvidia
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  levi       2136 F.... pulseaudio
   /dev/snd/controlC0:  levi       2136 F.... pulseaudio
   /dev/snd/pcmC0D0p:   levi       2136 F...m pulseaudio
  Date: Wed Oct 23 21:25:29 2013
  HibernationDevice: RESUME=UUID=0c3f021e-1d6f-4ed4-a9e4-00ff145e91ef
  InstallationDate: Installed on 2012-08-24 (425 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64+mac (20120724.2)
  MachineType: Apple Inc. MacBookPro10,1
  MarkForUpload: True
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=2888919c-46a6-41be-874a-f3af7333ec15 ro quiet splash nomodeset nomodeset acpi_backlight=vendor vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-10-17 (5 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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